Pope John XVIII (1003-1009)

At first glance, John XVIII is a minor pope of the late saeculum obscurum — fifth consecutive pope elected under the influence of the Crescentii of Rome, a period when the Apostolic See was barely emerging from the moral and political collapse inaugurated by the Theophylact clan a century earlier. No great council, no major dogmatic definition, no resounding canonization marks his six years of reign. Yet, three structural facts give him a real place in ecclesial history — and explain why an encyclopedic article devoted to him is legitimate.

The Pope who confirmed Bamberg and restored Merseburg

On the missionary level, John XVIII signs two diocesan acts of European importance. The restoration of Merseburg in 1004 reopened, after twenty-three years of suppression, the great missionary seat of the Sorbian Slavs, a Slavic people of the Elbe that the diocese was responsible for evangelizing since its first foundation in 968 by John XIII. The return of the diocese, under the episcopate of Wigbert (1004-1009) then of the historian Thietmar of Merseburg (1009-1018), inaugurates an episcopal continuity which the chronicler-bishop himself documents.^[21][22][23]

The pontifical confirmation of the foundation of Bamberg extends and amplifies this system. The new diocese, desired by the king of Germany Henry II and his wife Cunigunde, is designed as a missionary outpost among the pagan Wends of the Upper Main. John XVIII gave his canonical consent to it at the Roman synod of June 1007 (Kirsch), before the approval of the Germanic episcopate at the synod of Frankfurt on November 1, 1007 and the pontifical confirmation granted in 1008, once the boundaries had been fixed with Würzburg and Eichstätt (Lins). On the other hand, the direct submission of the diocese to the Holy See does not date from John XVIII: according to Lins, it was Benedict VIII, during his visit to Bamberg in 1020, who placed the diocese in direct dependence on the Apostolic See.^[24][25][26]

The historical irony is notable: a pope reputedly weak, dependent on the Crescentii for his very election, confirms by his signature two of the largest Germanic missionary seats of the High Middle Ages — and prepares, without his knowledge, the institutional mechanism that the Gregorian reform will deploy against the secular tutelage he is subject to.

The pope who reconciled Rome and Constantinople, half a century before the schism

On the ecumenical level, the pontificate of John XVIII presents a unique singularity in the century: the presence of the name of the Pope of Rome in the liturgical diptychs of the Patriarchate of Constantinople, under the Patriarch Sergius II (1001-1019). These diptychs — liturgical tablets where the patriarchs and popes recognized in communion are commemorated at each divine liturgy — had experienced, since the controversial pontificate of Sergius III (904-911), an intermittent commemoration of the Pope of Rome, in the context of Roman-Byzantine tensions of the 10th century (quarrel of the Tetragamy, jurisdictional rivalries in Southern Italy). The inscription of the name of John XVIII means, canonically, that the Patriarch of Constantinople recognizes the Pope of Rome as legitimate bishop in communion.^[27][28]

“In Constantinople he was recognized as bishop of Rome; his name appears on the diptychs of the Byzantine Church.” — Johann Peter Kirsch, “Pope John XVIII”, Catholic Encyclopedia, vol. VIII, 1910^[29]

The historical magnitude of this gesture can be measured by its distant reverse: forty-five years later, on July 16, 1054, the bulls of excommunication of the cardinal Humbert de Silva Candida against the patriarch Michael Cerularius will consummate the definitive schism between Rome and Constantinople. John XVIII had, through the diptychs of 1003-1009, extended universal communion by a precious duration — and one may read in it, as the author's interpretation, the sign that the Eastern schism does not arise from an irreversible theological fracture but from a chain of political and personal events which could, until the last hour, have been defused.

The pope who abdicated to die a monk – an extremely rare precedent

On the canonical level, the voluntary abdication of John XVIII in June 1009 constitutes an extremely rare event. The pontifical renunciations documented throughout the history of the Church are fewer than ten: Saint Pontian (235, under persecution), Saint Marcellinus (case debated, around 304), Saint Silverius (537, under Byzantine pressure), John XVIII (1009), Benedict IX (multiple renunciations, 1045-1048),Saint Gregory VI (1046, deposition-renunciation), Celestine V (the “gran rifiuto” of 1294), Gregory XII (1415, to resolve the Great Western Schism) and Benedict XVI (2013). On this very short list, John XVIII occupies a singular position: according to the majority hypothesis (Kirsch, Plöchl, Kelly), he would be the first in the history of the Church to abdicate without apparent direct constraint, solely to embrace monastic life — but the abdication itself rests only on the tradition of a single medieval catalogue, without any contemporary document.^[30][31][32]

“He voluntarily abdicated, retired to the monastery of Saint Paul near Rome, and died there as a simple monk in June 1009.” — Johann Peter Kirsch, “Pope John XVIII”, Catholic Encyclopedia, vol. VIII, 1910^[33]

The typological value of the gesture, in the spiritual perspective, is considerable: two centuries before Celestine V and a millennium before Benedict XVI, a pope of the saeculum obscurum -- deemed weak, exploited by the Crescentii, without much personal fame -- preferred to abandon the tiara to die dressed in the Benedictine cowl in the monastery of the Apostle Paul. For modern historians (Kelly, Mann, Plöchl), it is this monastic outcome which saves John XVIII from total oblivion and restores to him, a posteriori, an authentic spiritual silhouette that the administrative acts of his pontificate did not fully reveal.

Baptismal name: Phasianus / Fasano

The baptismal name of the future John XVIII is, according to medieval and modern sources, Giovanni Fasano — spelled in Latin Phasianus or Fasanus, and sometimes transcribed in modern Italian Fasanio or Fasani.^[34][35] The Latin form Phasianus literally means “pheasant”, a family nickname familiar in the aristocratic Rome of the 10th century, where animal nicknames (Boccadiporco = “pig snout”, Caetani, Orsini = “little bears”) were legion.

The traditional form Fasano or Fasani is preserved by the Catholic-Hierarchy database (David M. Cheney — a private project, without official status), which identifies the pope under the entry “Pope John XVIII (Fasano)”.^[36]

A Roman priestly family

According to the main testimony available to us, the notice of the abbreviated Liber Pontificalis summarized by Kirsch in the Catholic Encyclopedia of 1910 -, John XVIII is son of a Roman priest named Leo (in Latin Leo presbiter).^[37][38] The Ursus variant is notably carried by Horace K. Mann (The Lives of the Popes in the Early Middle Ages, vol. V — an attribution taken up by the English-language notice Pope John XVIII) and by Salvador Miranda's dictionary of cardinals, which gives “Son of Ursus (or Leo), who became a priest”: it remains in the minority against Leo presbiter, the only name retained by Kirsch's Catholic Encyclopedia.^[39][40]

The birth of children by Roman secular priests was, in the 10th century, canonically irregular but socially frequent. Priestly celibacy, prescribed by the canons since the Council of Elvira (around 305) and confirmed by the Roman councils of the 5th century, was not yet uniformly applied in the secular clergy -- a situation which would only be corrected after the reforms of Leo IX (1049-1054) then the I Lateran Council (1123). The canonical status of priests' sons was theoretically irregular, but several popes of the 10th and 11th centuries were actually sons or grandsons of clerics — starting with John XVII, immediate predecessor of John XVIII, himself married before his election and father of three sons who also became ecclesiastics.^[41]

“He was called John XVIII and was the son of a certain Leo, a priest.” — Johann Peter Kirsch, “Pope John XVIII”, Catholic Encyclopedia, vol. VIII, 1910^[42]

The district of birth is not known with certainty. The sources place the future pope in Rome itself — probably in one of the aristocratic rioni of the Champ de Mars or Trastevere.^[43]

The date of birth: a historiographic blank

No source provides the date of birth of Giovanni Fasano: Kirsch gives none, and Salvador Miranda's dictionary of cardinals explicitly bears “(No date found)”.^[44][45] Any estimate of his age at the election of December 1003 would be pure conjecture without a source: no range is therefore retained here.

Previous ecclesiastical career

No reliable document informs us about the ecclesiastical career of Giovanni Fasano before his election. He does not appear in the known lists of Roman cardinals from the beginning of the 11th century, which could suggest either a career as a Roman secular cleric without a formal cardinalate, or a cardinalate whose lists escape us. The Catholic-Hierarchy database simply notes “no further information found” for the period before 1003.^[46]

The **absence of distinctive ecclesiastical signs before the election is a trait common to several popes of the late saeculum obscurum: the Crescentii favored discreet figures for the Roman See, without a large personal power base, whose **election could be remotely guided without resistance and whose subsequent acts would remain in conformity with the interests of the clan.

The context: the sudden death of John XVII (November 1003)

The election of Giovanni Fasano is part of a political emergency context. The immediate predecessor, John XVII (born Sicco, Roman), had been elected under the same Crescentii influence on June 13, 1003 — and died, after only five months and three weeks of pontificate, on November 6, 1003. No significant act could have been taken during this lightning reign, and the Catholic Encyclopedia notes laconically: “concerning his activities during the few months of his pontificate, nothing has reached us”.^[47]

The rapid death of two consecutive popes (Sylvester II on May 12, 1003, after only four years of pontificate; John XVII on November 6, 1003, after six months) created a fragile institutional situation: in the space of six months, three popes succeeded one another at the Lateran, in a Rome controlled militarily by John II Crescentius and his patriciate.

John II Crescentius, Patricius Romanorum (1002-1012)

At the death of John XVII on November 6, 1003, real power in Rome was unquestionably in the hands of John II Crescentius (in Italian Giovanni Crescenzio), titled Patricius Romanorum since 1002, last head of the Crescentii family to control Rome.^[48][49]

The ancestry of this character explains his political ferocity: he is the son of Crescentius II Nomentanus, Patricius of Rome from 988 to 998, hanged by the emperor Otton III on April 29, 998 on the ramparts of the Castle Sant'Angelo for having revolted against Ottonian tutelage and having installed the antipope John XVI (John Filagatos, 997-998). The spectacular death of the father before the eyes of Rome -- body hung by the feet, displayed on the walls of the Castle -- had left in the son, then an adolescent, a deep hatred of Germanic tutelage, and a dynastic determination to regain, as soon as possible, effective control of the City.^[50]

The premature death of Otto III (January 24, 1002, at only 21 years old, without an heir) opens the political window that John II Crescentius was waiting for: in the imperial void that followed, the young Crescentius settled down as Patricius in Rome and regained control of the Apostolic See. He installed three consecutive popes there: John XVII (June-November 1003), John XVIII (1003-1009), Serge IV (1009-1012) — upon his own death in the spring of 1012, the era of the Crescentii in Rome came to an end.^[51]

The election of December 25, 1003

Seven weeks after the death of John XVII, on December 25, 1003 — the day of the Nativity of the Lord, chosen with deliberate symbolic significance — the Roman clergy and people, under the direct influence of John II Crescentius, elected Giovanni Fasano to the Apostolic See. The consecration follows in the first days of January 1004 — which explains why some sources date the pontificate to “1004”, calculating from the episcopal consecration, and others to “1003”, calculating from the election itself: both dates designate the same accession, and the official list of the Holy See retains 1003-1009.^[52][53][54]

The election under Crescentian influence is attested by scholarly notices: Kirsch as well as the New Catholic Encyclopedia link the accession of John XVIII to the ascendancy of John II Crescentius over Rome.^[55][56]

Relative independence?

Unlike his predecessor John XVII, simple creature of the Crescentii clan of whom no autonomous act is known, John XVIII displays, from the first months of his pontificate, a certain independence vis-à-vis the clan. The New Catholic Encyclopedia explicitly notes: "he was less dependent on the Roman patrician family of the Crescentii than his predecessor John XVII".^[57]

Several clues corroborate this relative autonomy:

1. Cooperation with Henry II on the founding of Bamberg and the restoration of Merseburg — while the Crescentii were, politically, adversaries of the Germanic king.
2. Acceptance of pallium as a tool of universal government, a practice that the most exploited pontificates tended to neglect.
3. Continuity of the mission of Bruno of Querfurt in Eastern Europe (commission from Sylvester II, executed under his pontificate), in the Ottonian movement close to the imperial court.
4. Active diplomacy with Constantinople — sphere over which the Crescentii had no leverage.

This autonomy, however, should not be overestimated: on Roman ground itself, the pope never intervenes in the civil affairs of the City, does not convene any major political synod, and does not pronounce any sentence against aristocratic families. The division of labor between John II Crescentius (temporal government) and John XVIII (spiritual government) is, in the author's reading, the only formula then politically viable for a papacy without temporal means of its own.^[58]

The restoration of the bishopric of Merseburg (1004)

One of the first documented acts of the pontificate was the restoration, in 1004, of the diocese of Merseburg — a Saxon missionary seat abolished twenty-three years earlier.^[59][60]

History of the suppressed diocese

The diocese of Merseburg had been founded in 967-968 by the emperor Otto I and confirmed by John XIII at the synod of Ravenna in 968. Its mission: to evangelize the Sorbian Slavs, Slavic people of the Elbe and the Saale who populated the eastern border of the Holy Roman Empire. Suppressed in 981 by Benedict VII under pressure from Otto II — at the initiative of Gisilher, successor of Boso at Merseburg, who aimed at the archbishopric of Magdeburg —, the seat remained vacant for two decades.^[61]

The restoration of 1004

Upon the death of Archbishop Gisilher of Magdeburg in 1004, the King of Germany Henry II seized the opportunity to reestablish the diocese of Merseburg as an autonomous missionary diocese. John XVIII conferred ecclesiastical privileges on the restored see (Kirsch: “conferred ecclesiastical privileges on the re-established See of Merseburg”; regesta of the acts of the pontificate gathered in Jaffé, Regesta, I, 2nd ed., pp. 501-503, cited as a source by Kirsch)^[62][63][64] — Wigbert became its first bishop (1004-1009), to whom Thietmar himself would succeed.^[65] The diocese, now suffragan of Magdeburg, was not intended to recover its entire territory from 968 but will be almost exclusively a missionary jurisdiction among the Sorbs.^[66]

Thietmar of Merseburg, the chronicler of the restored diocese

On the death of Wigbert in 1009 -- a striking coincidence with the death of John XVIII -, the seat fell to Thietmar of Merseburg (1009-1018), future great chronicler of Ottonian Germania and author of the Chronicon Thietmari Merseburgensis, a fundamental historical source of the reign of Henry II. The episcopal continuity of Merseburg, reopened by John XVIII in 1004, thus continues with the chronicler-bishop himself.^[67]

The founding of the diocese of Bamberg (1007)

The most resounding ecclesial act of the pontificate remains the pontifical confirmation of the foundation of the diocese of Bamberg — foundation initiated by Henry II and his wife Cunigunde of Luxembourg (future Saint Cunigunde), first consented to at the Roman synod of June 1007 chaired by John XVIII (Kirsch: “gave his consent at the Roman Synod of June, 1007”), then approved by the Germanic episcopate at the imperial synod of Frankfurt on November 1, 1007, before the definitive pontifical confirmation — dated 1007 by Plöchl, 1008 by Lins after the fixing of the diocesan boundaries.^[68][69][70]

Missionary and imperial logic

Henry II's project is double. On the political level, it is a question of reducing the power of the marquisate of Nordgau — deposed in 1004 —, by redistributing its lands to a diocese loyal to the Crown. On the missionary level, the new see is intended to evangelize the Bohemian Slavs and the Eastern Wends who populate the northeastern border of Bavaria.^[71][72]

The Synod of Frankfurt (November 1, 1007)

On November 1, 1007, in Frankfurt am Main, Henry II convened a great imperial synod bringing together the Germanic episcopate around Archbishop Willigis of Mainz, who gave his authority to the bull of John XVIII for the erection of the diocese. The objective is to obtain episcopal consent to the foundation — canonically necessary step because the creation of the new diocese reduces the territory of the bishoprics of Würzburg and Eichstätt, whose holders must accept the cession. At the end of these negotiations, the boundaries of the diocese were fixed — in 1008 according to Lins — and John XVIII granted his definitive pontifical confirmation (which Plöchl for his part dates to 1007).^[73][74][75]

The Roman synod of June 1007 and the papal confirmation

However, it is the Roman synod of June 1007 -- five months earlier than the synod of Frankfurt -, presided over by John XVIII, which constitutes the canonical key of the foundation. This is where the pope gives his explicit consent to the erection of the new seat. Without this papal authorization, the imperial synod of Frankfurt would have been canonically void. Kirsch sums up soberly: "he gave his consent to the Roman synod of June 1007 to the establishment of the See of Bamberg".^[76]

“He gave his consent at the Roman synod of June 1007 to the establishment of the See of Bamberg, founded and endowed by the German King Henry II.” — Johann Peter Kirsch, “Pope John XVIII”, Catholic Encyclopedia, vol. VIII, 1910^[77]

Consent in 1007, confirmation in 1008 — and direct submission only in 1020

The canonical role of John XVIII in the foundation breaks down into two stages, which must not be confused with the later exemption: the explicit consent given at the Roman synod of June 1007 — without which the synod of Frankfurt would have been canonically fragile —, then the pontifical confirmation granted in 1008, once the boundaries of the diocese had been fixed with Würzburg and Eichstätt (Lins). As for the direct submission of the diocese to the Holy See, it is later than the pontificate: it was Benedict VIII, during his visit to Bamberg in 1020, who placed the diocese in direct dependence on the Apostolic See.^[78][79][80]

The first consecrated bishop is Eberhard I (1007-1040), former chancellor of Henry II, ordained by Archbishop Willigis of Mainz by virtue of the pontifical bull of John XVIII.^[81] The Bamberg Cathedral was consecrated on May 6, 1012 — three years after the death of John XVIII — and today houses the burials of Henry II († 1024) and Saint Cunigunde († 1033/1040), canonized in 1146 and 1200 respectively.^[82]

The archiepiscopal pallium: Trier and Canterbury

Saint Aelfheah of Canterbury (1006-1012)

The granting of the pallium to the Archbishop of Canterbury is one of the most charged acts of spiritual significance of the pontificate. The beneficiary is Aelfheah (in Old English Ælfheah, in Latin Elphege) — Benedictine monk of Glastonbury, abbot of Bath, bishop of Winchester (984-1006), finally archbishop of Canterbury from 1006 to his death as a martyr on April 19, 1012 under the blows of the Danish Vikings of Thorkell the Great.^[83][84]

The granting of the pallium to Aelfheah by John XVIII in 1007 -- the moment when the future martyr went to Rome to receive the archiepiscopal insignia -- inscribed in the tradition of Roman veneration of the Anglo-Saxon Church, uninterrupted since Saint Augustine of Canterbury (596). Five centuries after the Gregorian mission, Canterbury continues to receive its archbishop directly from the hands of the Pope -- a fact which founded, until the Henrician rupture of 1534, the universal communion of the Church of England with Rome.^[85][86]

“He conferred the pallium on Archbishop Meingaud of Trier and Elphege of Canterbury.” — Johann Peter Kirsch, “Pope John XVIII”, Catholic Encyclopedia, vol. VIII, 1910^[87]

Meingaud of Trier (1008)

The other beneficiary is Meingaud (sometimes transcribed Meingaudus, Megingaud or Megingoz), archbishop of Trier: the pallium conferred on him by John XVIII is attested by Kirsch as well as by the New Catholic Encyclopedia.^[88][89] The granting of the pallium confirms the continuity of the Treverean pre-eminence among the Germanic metropolitan sees -- Trier being, since Late Antiquity, considered the oldest Christian foundation in Germany (mission of Saint Maternus in the 4th century).

The simultaneous granting of the pallium to an Anglo-Saxon archbishop (Aelfheah) and to a Germanic archbishop (Meingaud) in the last years of the pontificate testifies to the concrete universality of papal jurisdiction, even in the context of a pope considered politically weak. The pallium is, already at this time, the canonical instrument by which Rome verifies and recognizes the metropolitan authority of the archbishops of Latin Christendom.

The Roman synod of June 1007: an active conciliar pontificate

Beyond the confirmation of Bamberg, the Roman synod of June 1007 testifies to a conciliar activity that late sources underestimate. It is, as far as the sources allow it to be reconstructed, the main legislative moment of the pontificate -- the moment when the pope gathers around him the bishops of central Italy and papal Italy for the major affairs of the moment: confirmation of monastic privileges, reception of ecclesial complaints, discipline of the clergy.^[90][91]

The most detailed affair of the pontificate — and the best documented by French sources — concerns the defense of the privileges of the great royal abbey of Fleury (Saint-Benoît-sur-Loire) against the resistance of two Gallican bishops of the ecclesiastical province of Sens.

Fleury Abbey and its canonical exemption

The Abbey of Saint-Benoît-sur-Loire — founded around 651, guardian of the relics of Saint Benedict brought from Monte Cassino (according to tradition) around 660 — had become, since the Clunisian reform of the 10th century, one of the largest Benedictine monasteries in the Kingdom of France. It benefited from canonical exemptions with respect to the diocesan bishop (Orleans) and the metropolitan archbishop (Sens), confirmed successively by several pontiffs.^[92]

Abbot Gauzlin (1004-1030)

The current abbot is Gauzlin (Latin Goslinus), half-brother of the king of France Robert II the Pious (996-1031), appointed abbot of Fleury in 1004, future archbishop of Bourges from 1013. A figure of great intellectual stature, Gauzlin guided the abbey towards an ambitious construction policy (Romanesque bell tower-porch from the 11th century) and fiercely defends the papal exemptions against diocesan pressures.^[93][94]

The double episcopal front: Letericus of Sens, Fulk of Orleans

Around 1007, two bishops of the province of Sens contested the exemptions of Fleury:

• Letericus (Léothéric), archbishop of Sens (999-1032), metropolitan bishop to whom the abbey refuses jurisdiction.
• Fulk (Fulco) II of Orleans, bishop of Orleans (around 1003-1014), diocesan bishop on whom the abbey depends territorially.

The two prelates attempted to force Gauzlin to burn the pontifical charters which are the basis of the exemption — a canonically serious gesture which would constitute a de facto abrogation of the privileges granted by Rome.^[95]

The pontifical intervention

Informed of the situation by Gauzlin, John XVIII reacted with a firmness that nothing in the rest of the pontificate suggested: he complained of it to Henry II — whom Kirsch calls “the emperor” although in 1007 Henry was still only king of Germany (he would not be crowned emperor until 1014) — and summoned the two bishops to appear at his tribunal, under threat of ecclesiastical censures for the entire kingdom.^[96]

“Pope John XVIII asserted the authority of the Papal See when Archbishop Letericus of Sens and Bishop Fulco of Orleans refused to let Abbot Goslin of Fleury enjoy the privileges granted by Rome, and tried to make him burn the pontifical charters. He complained of it to the emperor and summoned the two bishops to his tribunal, under threat of ecclesiastical censures for the entire kingdom.” — Johann Peter Kirsch, “Pope John XVIII”, Catholic Encyclopedia, vol. VIII, 1910 (“The pope complained of this to the emperor, and called both bishops to his tribunal under threat of ecclesiastical censures for the entire kingdom”; Kirsch designates Henry II as “emperor” although he was still only king of Germany)^[97]

Kirsch specifies neither the exact nature of the threatened censures — he does not speak of a formal interdict — nor what followed the summons: only the threat of censures for the entire kingdom is attested by his notice.

Outcome of the case

The precise outcome of the quarrel is not documented: no consulted source reports the effective application of the threatened censures. Abbot Gauzlin remained in office until his death in 1030 and the abbey retained its canonical exemptions.^[98]

The other major missionary project of the pontificate of John XVIII is the mission of Saint Bruno of Querfurt — Saxon Benedictine monk, disciple of Saint Romuald of Ravenna — to evangelize the pagan peoples of Eastern Europe, by virtue of the commission received from Sylvester II and executed under his pontificate.^[99]

Bruno of Querfurt (c. 974-1009)

Bruno was born around 974 in Querfurt (Saxony), into a noble family close to the Ottonian court. Chaplain of the emperor Otton III from 996, he accompanied the sovereign to Rome then converted to eremitical life under the ascetic direction of saint Romuald, founder of the Camaldolese reform, in the hermitage of Pereum near Ravenna (998-999). Inspired by the martyrdom of his friend Saint Adalbert of Prague (997) among the Prussians, he wrote a Vita Sancti Adalberti and decisively turned towards the Slavic mission.^[100]

The archiepiscopal consecration of February 1004

Under the pontificate of Sylvester II (999-1003), Bruno received in 1003 the missionary commission for the Slavic peoples: Sylvester II appointed him archbishop of the pagans and conferred the pallium on him, reserving the consecration to the archbishop of Magdeburg. It was under John XVIII that this commission was executed: in February 1004, in Magdeburg, Bruno received the archiepiscopal consecration from the hands of Tagino, archbishop of Magdeburg — by virtue of his appointment as archbishop of the pagans (archiepiscopus gentium), charged with evangelizing the pagan peoples from the Danube to the Baltic.^[101]

The title of "archbishop of pagan peoples" (archiepiscopus gentium) that Bruno received was, at that time, an exceptional canonical status: he was a missionary archbishop without fixed seat, whose jurisdiction extended to all lands where he could found local Churches. The direct precedent is Saint Adalbert of Prague, archbishop of Prague from 982 to 997, died martyr among the Prussians on April 23, 997.

Hungary, Pechenegs, Kievan Rus'

Between 1004 and 1008, Bruno led three major missionary campaigns:

1. Magyar Hungary — where he tried to convert Duke Ahtum to Roman jurisdiction (in the face of Byzantine pressure); there he composed his famous Vita Quinque Fratrum (life of the Five Brothers) on the Polish hermit martyrs of Mieczyslaw.^[102]

2. Pechenegs — semi-nomadic Turkic people between Danube and Don; Bruno stayed there five months and baptized around thirty adults in conditions of extreme precariousness.

3. Kievan Rus' — where Bruno comes into contact with Prince Vladimir I (baptized in 988) and with the already established Christian community. The presence of the Roman missionary in Kyiv contrasts with the Byzantine orientation already taken by Rus', but testifies to an active pontifical policy not to cede eastern terrain to Constantinople.

The martyrdom of March 9, 1009 among the Prussians

In late 1008 or early 1009, Bruno undertook his last mission: convert the Old Prussians (Pruzzi), a pagan Baltic people between the Baltic and the Vistula. With eighteen companions, he entered the country of the Sudoves (Yatvingians), a Prussian branch, and preached there for a few weeks. On March 9, 1009 — the date fixed by the Annals of Quedlinburg (7th day before the ides of March); the Catholic Encyclopedia (Meier) for its part retains February 14 —, on the orders of Zebeden, brother of the Prussian leader Netimer, Bruno was beheaded, and most of his eighteen companions were hanged. Duke Bolesław I the Brave of Poland redeemed their remains and had them transferred to Gniezno.^{[103][104][105]}

The martyrdom comes only a few months after the death of John XVIII, under whose pontificate the mission had unfolded. The Annals of Quedlinburg, main source for the date, also contain the first historically attested mention of the name “Lithuania” (Litua) — which makes the Brunonian martyrdom a founding document not only of the history of the Catholic mission in Eastern Europe, but also of Baltic history itself.^[106][107]

“Saint Bruno, nicknamed Boniface, archbishop and monk, was beheaded with his eighteen companions by the pagans on the border of Rus' and Lithuania, in the eleventh year of his conversion.” — Annales Quedlinburgenses, year 1009^[108]

The canonical and missionary scope of the Brunonian mission

The mission accomplished under John XVIII has three aspects of lasting importance. First, it extends Ottonian missionary continuity in a troubled political period. Secondly, it establishes the canonical status of the archbishop without seat (archiepiscopus gentium) -- a model which will be taken up by the mendicant missionaries of the 13th and 14th centuries. Third, it prepared, through the Baltic outposts, the future systematic evangelization of Prussia, Lithuania and Livonia which would later be carried out by of the Teutonic knights in the 13th century.

The eastern context: progressive distancing since 867

Since the Photian schism (867-879) and the complete restoration of communion by John VIII in 879, relations between Rome and Constantinople were technically reestablished, but affected by a basic tension which continued to strengthen: progressive Roman modification of the Creed by the addition of the Filioque, disputes over the jurisdiction over Southern Italy (between Rome and the Byzantine authorities of Calabria and Apulia), increasing liturgical divergences. The mutual commemoration in the liturgical diptychs — lists of patriarchs and popes recited during each divine liturgy — had become intermittent.^[109][110]

Liturgical diptychs: a sacrament of universal communion

The diptychs are not a simple administrative register. They constitute, in the Eastern tradition, the major liturgical expression of ecclesial communion. Including a patriarch or a pope in the diptychs means that the celebrant recognizes him as a legitimate bishop in Catholic communion. Omitting one means that the celebrant breaks communion with him. For this reason, the diptychs are, in Eastern sacramental theology, considered canonical equivalents of a profession of faith of communion.^[111]

The reinstatement of the name of John XVIII (around 1004-1009)

Under Patriarch Sergius II of Constantinople (1001-1019 — elected in June/July 1001 after a vacancy of the see, died in July 1019), on a date not precisely documented between 1004 and 1009, the name of John XVIII is restored in the diptychs of the Byzantine Patriarchate. This restoration is, on the liturgical level, a documented ecumenical act between Rome and Constantinople, prior to the final schism of 1054.^{[112][113][114]}

The historical significance of this gesture can be measured by its distant reverse: forty-five years later, on July 16, 1054, Cardinal Humbert de Silva Candida, papal legate in Constantinople, excommunicated the patriarch Michael Cerularius in the basilica of Hagia Sophia, by placing the decree of excommunication on the high altar. The patriarch Michael Cerularius will respond with a symmetrical excommunication of the legates. The definitive schism — which still lasts today — was consummated.^[115]

“Under Patriarch Sergius II, Constantinople once again recognized the Pope of Rome; the name of John XVIII was put back on the diptychs.” — Paraphrase of Johann Peter Kirsch, “Pope John XVIII”, 1910 (“In Constantinople he was recognized as Bishop of Rome […] His name appears on the diptychs of the Byzantine Church”)^[116][117]

The epitaph of Saint Paul Outside the Walls

The fact that John XVIII obtained this reintegration of the diptychs is exceptional enough for his epitaph at Saint Paul Outside the Walls to keep explicit trace of it. The Catholic Encyclopedia of 1910 cites textually the formulation: “his epitaph reports that he subdued the Greeks and dislodged the schism”.^[118] Late encyclopedic notices which reproduce a Latin couplet for this epitaph cite no preserved primary epigraphic text that would allow it to be verified; in the absence of an exact source, the Latin text is not reproduced here — only Kirsch's English version, backed by the Liber Pontificalis (Duchesne ed., II, 266), is attested.

For modern historians (Plöchl, Mann), the formula must be read with caution: it is not a canonical submission of the Byzantine patriarchate to Rome -- a gesture that never happened -, but a commemoration of the pope's name at Constantinople whose ephemeral character was undoubtedly already perceived at the time. The epitaph is, in this reading, an act of memory more than a legal finding: John XVIII extended the universal communion in the diptychs, and it is this memory that the monks of Saint Paul wanted to fix in stone, aware that the rupture would become rapidly effective.

A universal communion extended in extremis

As the author's interpretation, the episode of the diptychs of John XVIII has a typological value: it suggests that the rupture between Rome and Constantinople was not doctrinally irreversible, that several reconciliations were possible at the turn of the millennium, and that the schism of 1054 is not the result of a theological inevitability but of a political sequence which could have been avoided. It is this same conviction which would underpin, a thousand years later, modern ecumenical efforts: mutual lifting of the anathemas of 1054 by Paul VI and Athenagoras on December 7, 1965, at the close of the Vatican II council; repeated meetings between John Paul II, Benedict XVI, Francis and the patriarchs Bartholomew I and Cyril.

A very rare gesture, attested by a single medieval catalogue of popes (the so-called “catalographic” tradition)

In June 1009, after five years and six months of pontificate, John XVIII made the gesture which constitutes, in the long term, the most extraordinary originality of his reign: he voluntarily abdicated from the Apostolic See and withdrew withdrew to the Benedictine monastery of Saint Paul Outside the Walls (San Paolo fuori le Mura), outside Rome, to die as a simple monk.^{[119][120][121][122][123]}

A historical singularity

Before John XVIII, the only precedents of papal abdication are contested or linked to extraordinary circumstances:

• Saint Pontian (230-235) abdicated in 235 during his deportation to Sardinia under the persecution of Maximin the Thracian — abdication imposed by persecution, not a free gesture.
• Saint Marcellin (296-304) would have renounced the pontificate after his act of weakness under the persecution of Diocletian (case debated by historians).
• Saint Silverius (536-537) abdicates under Byzantine pressure from Theodora.

None of these precedents corresponds exactly to the situation of 1009: John XVIII is neither persecuted, nor prisoner, nor constrained by a civil authority. No contemporary source documents any direct pressure on the pope to abdicate. The renunciation appears, when the sources are read, as a voluntary and personal act -- which would make it, according to the majority hypothesis (Kirsch, Plöchl, Kelly), the first free pontifical abdication of ecclesial history, if the tradition of the single catalogue is exact.^{[124][125][126]}

The reasons: a blank of the sources

No contemporary source specifies the motives for the abdication. Modern historians have put forward several hypotheses:

The Britannica concludes soberly: "he eventually abdicated for unknown reasons".^[127]

“He eventually abdicated for unknown reasons.” — Encyclopædia Britannica, “John XVIII”^[128]

Withdrawal to Saint Paul Outside the Walls

The basilica and the Benedictine monastery of Saint Paul Outside the Walls — founded in the 4th century by Constantine on the tomb of the apostle Paul, enlarged by Theodosius and Valentinian II in the following century — were, at the beginning of the 11th century, one of the largest monasteries of the Eternal City. The withdrawal of the resigning pope into this symbolic space takes on an obvious spiritual dimension: John XVIII chooses to die next to the tomb of the apostle of the Gentiles -- figure of the universal missionary, of which the missionary work of Bruno of Querfurt and the reconciliation with Constantinople were like the modern continuation.

Death as a monk

A few weeks after his abdication — between mid-June and the end of July 1009 —, John XVIII died in the monastery as a simple Benedictine monk. The medieval sources insist on this point: he died dressed in the monastic cowl, having renounced not only the tiara but the whole set of pontifical insignia. According to the tradition reported by W. M. Plöchl in the New Catholic Encyclopedia, he is buried in the basilica of Saint Paul Outside the Walls — burial distinct from those of the other popes (buried in the Lateran or Saint Peter), and which underlines, even in the funeral rite, his singular status as pope-monk.^[129][130] The tomb itself is not preserved: modern repertories of pontifical burials, backed by Wendy J. Reardon (The Deaths of the Popes, 2004), classify it as “unknown but destroyed”, with Saint Paul Outside the Walls or Saint John Lateran as hypotheses.^[131]

“John at length retired to St. Paul-outside-the-Walls and lived there as a monk. He is buried at the same monastery.” — W. M. Plöchl, “John XVIII, Pope”, New Catholic Encyclopedia, vol. VII, p. 936^[132]

The historiographical debate: real abdication or legendary story?

A few recent secondary notices have taken up the debate on the historical reality of the abdication; for lack of a new source, it remains dependent on the documentary limits below.^[133]

The objection is based on three elements:

1. Absence of pontifical document mentioning the abdication.
2. Very few chronicles of the period (Liutprand is dead, Thietmar of Merseburg did not cover this point).
3. Probability that tradition has embellished a death in office into a heroic abdication, to make the figure more edifying of the pope monk.

The majority consensus of modern historians (Kirsch, Plöchl, Mann, Kelly) nevertheless maintains the abdication as a probable historical fact, due to the consistency of the medieval sources, the mention of the pontificate in the tradition of the Liber Pontificalis (Duchesne ed., II, 266, cited as a source by Kirsch),^[134] and the continued tradition in the pontifical historiography since the 16th century.

The successor: Serge IV (Pietro Boccadiporco)

A few weeks after the death of John XVIII, on July 31, 1009, the Roman clergy and people elected his successor: Pietro Boccadiporco (literally “pig snout” — personal nickname), who took the pontifical name of Serge IV. This choice of a new pontifical name breaks with the practice of John XVIII (who had kept his baptismal name) and inaugurates the systematization of change of name at election -- a practice which will only be really universalized from Leo IX (1049-1054).^[135][136]

A baptismal name retained: a rare case until Adrian VI

John XVIII kept his baptismal name as his pontifical name: elected Giovanni, he reigned under the name of John XVIII. The next two attested cases in the modern era are Adrian VI (Adriaan Florensz, 1522-1523) — last non-Italian pope before John Paul II, of a reformer's simplicity and austerity — and Marcellus II (Marcello Cervini, 1555), who likewise kept his first name Marcel: according to Herbert Thurston, Adrian VI is “the only pope of modern times, except Marcellus II, who retained his baptismal name”.^[137]

This onomastic rarity makes John XVIII a discreet link in the chain of popes who kept their baptismal names -- a chain which leads, a thousand years later, to figures like Albino Luciani, who became John Paul I in 1978 (who broke precisely with this logic by choosing a new compound name) and Karol Wojtyła, who became John Paul II in 1978 as well.

The silence of the Liber Pontificalis and the scarcity of sources

The relative silence of medieval sources on the pontificate of John XVIII is a historiographically remarkable fact. The Liber Pontificalis — collection of pontifical biographies held in Rome since the 6th century — reduces the pontificate to a few lines, mentions no specific act, and concludes with monastic withdrawal. No contemporary chronicler of the stature of Liutprand of Cremona (for John XII) or Thietmar of Merseburg (for the Ottonian emperors) wrote a sustained biography of John XVIII.^[138]

This documentary discretion is explained by three converging factors:

1. The political erasure of the Pope behind the Crescentii makes his actions non-strategic for political chroniclers.
2. The absence of a great trial, a great scandal or a great council -- factors that mobilized medieval documentary production.
3. The general rarity of Roman sources from the early 11th century: documentary depression of the Lateran before the Gregorian Renaissance.

A transitional figure between the Crescentii age and the Salian age

For historians of the papacy, John XVIII occupies a hinge position: he is the last of the Crescentii popes to have left a visible work (Bamberg, Merseburg, Canterbury, pallia, Byzantine diptychs, Bruno of Querfurt). With his successor Serge IV (1009-1012) and the death of John II Crescentius in 1012, the Crescentii era ends. The papacy then came under the tutorship of the counts of Tusculum (1012-1044) — another Roman aristocratic dynasty which would dominate three consecutive pontificates (Benedict VIII, John XIX, Benedict IX) before the catastrophe of the three simultaneous popes of 1045 which would call for the intervention of Henry III and the beginning of the Gregorian reform.

Spiritual significance: the pope who chose to become a monk

Beyond the administrative assessment, it is the spiritual dimension of the outcome of June 1009 which constitutes the profound legacy of John XVIII. Giving up the tiara to die a monk is a gesture which, in the Christian spiritual tradition, has greater value than all ordinary pontifical acts. A thousand years later, Benedict XVI — at the moment of announcing his renunciation on February 11, 2013 — will invoke the inner freedom of a pope who recognizes himself, before God, incapable of continuing to bear the burden of the Apostolic See. Without explicit reference, John XVIII remains, in the long term, an early medieval witness of this spiritual possibility — if one follows the majority hypothesis on his abdication.

“For this, well aware of the seriousness of this act, in complete freedom, I declare that I renounce the ministry of Bishop of Rome, Successor of Saint Peter.” — Benedict XVI, Declaratio of February 11, 2013, delivered in Latin during the consistory for the canonization of the martyrs of Otranto^[139]

For the Catholic tradition, the chain of this possibility therefore goes back, through Celestine V (1294) and -- more discreetly -- John XVIII (1009), to a fundamental theological conviction: the pope is a servant, not an owner of the apostolic office. He can, in conscience, return it when he discerns that another is better able to carry it. This principle, brought to full light by Benedict XVI in the 21st century, had silently crossed the second millennium in hidden lives -- the first of which, perhaps, is that of a forgotten pope from the beginning of the 11th century, who died a monk in the monastery of the Apostle Paul.

• Pope John XVII (June-November 1003) — immediate predecessor, married and father of three ecclesiastics.
• Pope Sergius IV (1009-1012) — successor, Pietro Boccadiporco, last pope of the Crescentii era.
• Pope Sylvester II (999-1003) — first French pope, Gerbert of Aurillac, mathematician and theologian.
• Pope John XII (955-964) — great scandalous pope of the saeculum obscurum.
• The Crescentii family — Roman dynasty that controlled the papacy from 974 to 1012.
• Saint Henry II (king 1002, emperor 1014) — founder of Bamberg and restored Merseburg.
• Saint Bruno of Querfurt (c. 974-1009) — martyred missionary, founder of the Baltic mission.
• Saint Aelfheah of Canterbury (c. 953-1012) — martyred archbishop under the Danish Vikings.
• Saint-Benoît-sur-Loire Abbey — large royal abbey flourishing at the beginning of the 11th century.
• The schism between Rome and Constantinople (1054) — definitive break, forty-five years after the diptychs of John XVIII.
• Papal renunciation — history and theology of a rare gesture in the Catholic Church.