Pope Theodore I (642-649)

Theodore I, a Greek pope born in Jerusalem, governs Rome from 642 to 649 and prepares the condemnation of monothelitism that will be proclaimed at the Lateran Council under Martin I.

Ignispedia

Pope Theodore I (Theodorus I) governed the Church of Rome from 24 November 642 to 14 May 649. The Holy See presents him as the 73rd pope of the Catholic Church, born in Jerusalem, successor of John IV and predecessor of Martin I.[1]

His pontificate belongs to the great anti-monothelite sequence — against monothelitism, the error that acknowledges only one will in Christ — opened after the ambiguities of Honorius I: Severinus refuses the Ecthesis of Heraclius (the imperial edict of 638 imposing this single will), John IV condemns the error and defends Honorius against Pyrrhus, Theodore I turns this resistance into lasting Roman pressure on Constantinople. The question is Christological, but everything is at stake in it: imperial authority, the freedom of Rome, the African synods, the apocrisiarii (the pope's permanent envoys at Constantinople), Maximus the Confessor and the future Lateran Council of 649.[2][3]

Theodore is also a pope profoundly Eastern by birth, language and networks. A Greek from Jerusalem, he receives in Rome the dossiers of Palestine, Africa and Constantinople, welcomes the public retraction of Pyrrhus, appoints Stephen of Dor apostolic vicar in Palestine, and prepares the doctrinal ground on which Martin I will assemble the Lateran Council a few months after his death.[4][5]

"That nothing be diminished from the things canonically defined, and that nothing be changed nor added thereto." (original English wording of the Acts as cited in the note) — Letter of Pope Agatho read at the Third Council of Constantinople (4th session, 15 November 680), heir to the Roman line fixed before him by Theodore and Martin[6]

Why Theodore I matters

Theodore I is often overshadowed by two figures easier to recount: John IV, the Dalmatian pope of the anti-monothelite synod of 641, and Martin I, the martyr pope arrested after the Lateran Council of 649. Yet it is under Theodore that the crisis shifts from a still-cautious Roman response toward a broader confrontation, involving Africa, Palestine, Cyprus, Maximus the Confessor and the Roman legates at Constantinople.[7][8]

His role is therefore preparatory, but not secondary. He does not preside over the Lateran Council; he dies before it. But he makes that council possible: the dossiers, the African correspondence, the formal warnings to Paul II, the temporary reception of Pyrrhus, the mission of Stephen of Dor and the resistance of the Roman apocrisiarii already belong to his pontificate.[9]

The Greek pope from Jerusalem

The Vatican gives Jerusalem as his birthplace.[10] The Catholic Encyclopedia specifies that he was a Greek from Jerusalem, son of a bishop named Theodore.[11] This detail is rare in the pontifical list. Rome, in the 7th century, is not an ethnically closed Church: it welcomes Dalmatians, Greeks, Syrians, Eastern monks and refugees from provinces shaken by the Persian wars, the Arab conquests and the Christological controversies.

This origin helps explain his pontificate. Theodore is not a Latin discovering the East from afar. He belongs by birth to the very region that monothelitism claims to pacify: Jerusalem, Palestine, the Eastern patriarchates, the monks, the Greek-language debates. His Roman firmness is therefore not anti-Eastern; from Rome it defends the complete faith of Christ as the orthodox East itself bore it through Sophronius, Maximus and the resisters of Palestine.[12]

A pope of doctrinal primacy under Byzantine domination

The historical contradiction is stark: politically, Rome still depends on the Byzantine Empire; doctrinally, it becomes the place where imperial error is contested. Theodore is consecrated swiftly, probably because the Exarch of Ravenna confirms the election of a Greek pope without long delay; yet this same pope will refuse to recognize Paul II of Constantinople without canonical and doctrinal clarification.[13][14]

His pontificate thus illustrates Roman primacy in a concrete, non-triumphalist form. Rome does not have the armies of Constantinople; its apocrisiarii can be humiliated, their altar overturned, one of them exiled to Trebizond. Yet the bishops of Africa and the resisters of the East write to Rome as to the centre that must guarantee the faith.[15]

The principal sources

Table of witnesses

SourceDateWhat it contributesCaution
Holy Seecurrent list73rd pope, birth in Jerusalem, beginning and end of the pontificateVery brief notice
Liber PontificalisRoman traditionOrigin, duration, Roman works, translation of relics, burialLater narrative, to be read with Treccani
Letters of Theodore I642-649Conditions set for Paul II, appeals to the emperor, anti-monothelite correspondenceFragmentary texts transmitted in conciliar dossiers
Acts of the Lateran of 649October 649African letters, Pyrrhus-Paul dossier, record of Theodore's actionCouncil under Martin I, but prepared by the preceding phase
Maximus the Confessor645 and following yearsDispute with Pyrrhus, doctrine of the two wills, anti-monothelite networkMajor theological source, polemical context
Treccani2000Detailed modern synthesis: chronology, Pyrrhus, Paul, Maurice, Typos, Roman worksMost useful secondary source
Catholic Encyclopedia / New Advent1912Classic Catholic synthesis: action against Pyrrhus, Paul, Ecthesis, TyposOld, but clear and sourced
Saint John Laterancurrent heritageChapel of Saint Venantius built by John IV and Theodore IHeritage source, useful for the visual phase

The Holy See and the chronology

The current Vatican entry gives Theodore I as the 73rd pope, with the end of the pontificate on 14 May 649, and birth in Jerusalem.[16] The beginning indicated by modern lists is 24 November 642, after the death of John IV on 12 October 642.[17][18]

The article title therefore retains Pope Theodore I (642-649). The important fact is not only the six-and-a-half-year duration; it is the place of the pontificate in the ascent toward the Lateran of 649. Theodore dies just before the imperial Typos (the edict of 648 forbidding discussion of the one or two wills of Christ) is condemned synodally by Martin I.[19]

The Liber Pontificalis and the Roman works

The Liber Pontificalis, cited by Treccani and by the critical tradition, presents Theodore as a Greek pope from Jerusalem and attributes to him several material acts: Saint Valentine near the Milvian Bridge, the chapel or decoration of Saint Venantius at the Lateran, the translation of Saints Primus and Felician to Santo Stefano Rotondo, gifts of silver for the confession of Saint Peter, an oratory of Saint Euplus and a place dedicated to Saint Sebastian near the Lateran.[20]

Treccani nuances certain points. For Saint Valentine, it is more likely that Theodore completed or restored an already existing basilica rather than building an entirely new shrine. By contrast, the 648 translation of Primus and Felician is solidly attributed to the pope and constitutes a major milestone in the history of Roman relics.[21]

The Acts of the Lateran of 649

The Lateran Council of 649 is held under Martin I, not under Theodore. But it preserves the immediate memory of the preceding pontificate: African letters, the Pyrrhus dossier, the judgment on Paul, the condemnation of the Ecthesis and the Typos. The acts show that Roman opposition did not spring up in October 649; it had been built up over years.[22]

In Agatho's letter to Constantinople III, a few decades later, the Roman line is formulated with a density that has become classic: the faith received from the apostles and the five councils must be kept without diminution, change or addition.[23] This formulation retrospectively illuminates Theodore's struggle: it was not a matter of adding a Western subtlety, but of preventing an imperial formula from diminishing the humanity of Christ.

Before the pontificate: an Easterner in Rome

A birth in Jerusalem

Jerusalem, at the beginning of the 7th century, has just lived through a series of shocks: the Persian capture in 614, the return of the True Cross under Heraclius, then the Arab conquest in the 630s. Theodore is born into this Eastern horizon, even though the sources give neither date of birth nor account of childhood.[24][25]

This silence must not be romanticized. We do not know whether he fled Palestine directly, whether he was formed in a specific monastic milieu, or by what route he reached Rome. What the sources allow us to affirm is more sober: he is Greek, from Jerusalem, son of a bishop named Theodore, and his pontificate will be entirely traversed by Eastern dossiers.[26]

The son of a bishop named Theodore

The mention of a bishop father surprises a modern reader, but it is not impossible in Late Antiquity: a married man could be ordained bishop after having children, under the continence rules then received. The source does not allow us to specify the career of this father any further.[27]

The detail remains significant. Theodore is not only a Greek by language; he comes from an ecclesial milieu. His pontificate reveals a man who understands the canonical stakes of patriarchal succession, the necessity of synods, the weight of professions of faith and the importance of a communion recognized by Rome.

Rome after John IV

John IV dies on 12 October 642.[28] His brief pontificate had already fixed three dossiers that Theodore receives still open: the Ecthesis must be withdrawn, Honorius must not be used as monothelite surety, and the wounded Eastern Churches must remain bound to Rome by faith, relics and charity.[29]

John IV's defence of Honorius — the Apologia pro Honorio addressed to the emperor, which upholds the orthodoxy of the positions taken by Honorius before the Ecthesis — is not the last word on the dossier.[30] The Third Council of Constantinople will strike Honorius with posthumous anathema in 681 for having followed Sergius and confirmed his teachings, while the Roman reception will retain above all his doctrinal negligence.[31] The articulation is therefore clear and leaves the Honorius objection unanswered in no respect: John IV was defending Honorius's intention against the monothelite use of his letters; the council of 681 judges the objective effect of those ambiguous letters. See Pope Honorius I and Third Council of Constantinople (680-681).

Theodore is consecrated on 24 November 642. This swiftness contrasts with the long crisis of Severinus and suggests that the Byzantine administration at first saw in him an acceptable candidate. History shows the opposite: the Greek origin of the pope will not make him docile to the Greek error of the court.[32]

Constantinople: Pyrrhus, Paul and the Ecthesis

The problem in simple language

Monothelitism affirms that there would be only one will in Christ. The apparent intention is to protect the personal unity of Jesus. But the theological result is dangerous: if Christ has no real human will, he does not fully assume our humanity, and the human obedience of Gethsemane becomes mere theatre.[33]

The Catholic faith will therefore confess two natural wills and two natural operations in the one person of the incarnate Word: the divine will and the human will. They are neither opposed nor separated; the human will of Christ perfectly follows the divine will.[34]

Pyrrhus deposed without canonical judgment

Theodore's first dossier concerns Pyrrhus, Patriarch of Constantinople, close to Sergius and a supporter of monothelitism. At the end of 641, Pyrrhus resigns or is sidelined in a troubled political context. Paul II succeeds him, and the news is sent to Rome.[35]

Theodore refuses to recognize Paul automatically. His reason is not only doctrinal: the deposition of Pyrrhus was not carried out according to the canons. If Paul wishes to be recognized, two things must be clarified: the regular deposition of Pyrrhus and the condemnation of the theses he had upheld.[36][37]

This requirement is crucial. Rome does not defend Pyrrhus as orthodox; it defends the canonical order. Even a suspect patriarch cannot be replaced by mere political expediency. The fight against heresy does not justify arbitrariness.

The letter to Constans II

Theodore also writes to Emperor Constans II. He invites him to defend orthodoxy by withdrawing the Ecthesis and to prevent an irregular patriarchal succession from producing a schism.[38]

The tone is typical of the Byzantine papacy: respectful toward the emperor, but firm on the faith. The pope does not ask the emperor to become a private theologian; he asks him not to impose on the Church a formula that wounds the received confession. Imperial power is called to serve the faith, not to manufacture it.

Paul II evades, then declares himself

According to Treccani, Paul II delays clarifying his position. His synodal letter, known through the acts of 649, finally declares a monothelite profession, attaching itself to the Ecthesis, to Sergius and even to the use made of Honorius.[39]

The situation then hardens. What could still look like a procedural question becomes a question of faith. Rome cannot recognize as fully orthodox a patriarch who professes a single will in Christ.

ActorPositionTheodore's response
PyrrhusDeposed patriarch, monothelite, then briefly retractedCanonical deposition required; reception possible after abjuration
Paul IISuccessor of Pyrrhus, belatedly declared monotheliteRecognition refused; admonitions then gradual rupture
Constans IIEmperor seeking unity through compromiseRoman request: withdraw the Ecthesis and preserve orthodoxy
RomePolitically weak apostolic seeDoctrinal and canonical guarantee

Maximus the Confessor and the retraction of Pyrrhus

The dispute of Carthage

In July 645, the Exarch of Africa Gregory organizes at Carthage a public dispute between Saint Maximus the Confessor and Pyrrhus. At the end of the debate, Pyrrhus declares himself convinced, abandons the monothelite theses and announces that he will go to Rome to hand Theodore a profession of abjuration.[40]

The event is theologically major. Maximus demonstrates that acknowledging two wills in Christ does not divide his person; on the contrary, it protects the integrity of the Incarnation. The human will of Christ is not an autonomous sinful will: it is the holy, free, perfectly obedient human will of the incarnate Word.[41]

Pyrrhus received in Rome

Pyrrhus arrives in Rome with Maximus. He publicly hands his profession of abjuration to the pope and, according to the Liber Pontificalis, Theodore welcomes him with an episcopal seat at his side, an honour matching his rank as former patriarch of the imperial city.[42][43]

"ut sacerdotem regiae civitatis" — "as bishop of the imperial city" (translation; sacerdos here denotes the bishop). — Liber Pontificalis, life of Theodore I (Duchesne ed., I, p. 332)[44]

The gesture is strong: Rome does not seek the humiliation of Constantinople. If the patriarch truly retracts, it knows how to receive him. Roman primacy appears here as a tribunal of faith, but also as a place of reconciliation.

A brief triumph

Pyrrhus's retraction does not last. After the death of Exarch Gregory, killed in 647 amid the Arab advance in Africa, Pyrrhus leaves Rome, takes refuge in Ravenna, renounces his abjuration and claims to have been coerced.[45]

Theodore reacts with a Roman synod of 646-647 that formally deposes Pyrrhus and strikes him with anathema.[46] The Catholic Encyclopedia places the excommunication of Pyrrhus in 648; the gap comes from chronological reconstructions of the sources.[47] For the article, the solid point is this: Theodore receives Pyrrhus after his retraction, then condemns him when he falls back into error.

The tradition of ink mingled with the Blood of Christ

A tradition reported by Theophanes and taken up by Treccani affirms that Theodore supposedly subscribed the condemnation of Pyrrhus with ink mingled with consecrated wine.[48] It must be presented cautiously: the gesture is famous, but it belongs to a register of liturgical and symbolic memory rather than to easily verifiable administrative proof.

Its meaning is nonetheless clear. For Rome, the controversy does not touch a secondary opinion. It touches the very mystery of Christ present in the Eucharist: true God, true man, with a real human will offered to the Father.

Africa, Palestine and Cyprus: Rome as centre of appeal

The African synods

The bishops of North Africa, gathered in several provincial synods, oppose the Ecthesis and write to Rome. Treccani stresses that these letters, transmitted by the acts of the Lateran of 649, recognize the pope's role as supreme guarantor of the faith and ask him to intervene with Constantinople.[49]

The African situation is complex. Exarch Gregory revolts against Constantinople; Byzantine Africa is soon threatened by the Arabs; political and doctrinal lines may intersect. But the ecclesial fact remains: the African bishops see Rome as the place of a doctrinal response against monothelitism.

Cyprus and Palestine

The Catholic Encyclopedia notes that bishops of Cyprus, Palestine and Africa express their loyal submission to Theodore's teaching.[50] This convergence matters: anti-monothelite resistance is not a Roman quarrel against the East; it is also Eastern, monastic and Palestinian.

In this line, Theodore appoints Stephen of Dor apostolic vicar in Palestine, with the mission of bringing the region's bishops back to the Roman position.[51] Stephen will become one of the important voices of the dossier transmitted to the Lateran of 649.

Maximus, Rome and the anti-monothelite network

Maximus the Confessor is not pope, but his theological role is decisive. Treccani presents him as the new great doctrinal authority of anti-monothelite opposition, able to structure resistance from Africa and to draw Pyrrhus into a public dispute.[52]

Theodore and Maximus thus act on two complementary planes. Maximus clarifies the theology; Theodore gives this clarification a Roman ecclesial centre. The strength of the crisis of 649 comes from this alliance: high-level theological thought and a resolute pontifical authority.

The Typos of Constans II

The compromise that forbids speech

In 648, Constans II publishes the Typos. The document withdraws the Ecthesis, but henceforth forbids discussing the one or two wills and the one or two operations in Christ.[53][54]

At first sight, the compromise looks like peacemaking: the contested text is removed and both camps are forbidden from continuing the dispute. In reality, it locks error in by silence. If the Church is forbidden to say that Christ possesses two natural wills, the exact confession of his humanity is prevented.

The Roman apocrisiarii mistreated

Constantinople's reaction turns violent. According to Eugenio Susi's synthesis in Treccani (2000, re-read live on 4 October 2026, relying on the acts of the Lateran synod of 649 and the Liber Pontificalis — sources to be handled with extreme caution as retrospective readings), the Roman delegates suffer intimidation: the altar of their Constantinopolitan residence, the Placidia palace, is torn down, and the apocrisiarius Anastasius, arrested for his protests against the edict, is exiled to Trebizond.[55]

This detail is essential. The crisis is not a polite academic exchange. Rome's representatives in the imperial capital are punished because they refuse to let the Typos stifle the confession of faith. The doctrinal freedom of the Church is paid for in the flesh of its envoys.

Theodore dies before the synodal condemnation

In the first months of 649, Constans II decides to send a delegation to Rome — charged, according to Treccani, presumably ("presumibilmente") with notifying the pope of the text of the Typos and soliciting on this basis the union of the Churches of Rome and Constantinople.[56] But Theodore dies before the imperial envoys even arrive. He is buried at Saint Peter's on 14 May 649.[57][58]

His successor, Martin I, will not seek imperial authorization before being consecrated and will assemble the Lateran Council in October 649. Theodore's pontificate thus ends on the brink of open rupture.[59]

Imperial textDateContentRoman response
Ecthesis638One single will in ChristSeverinus refuses; John IV condemns; Theodore demands withdrawal
Letter of Paul IIaround 645More explicit monothelite professionTheodore issues formal warnings, then Rome gradually breaks
Typos648Withdrawal of the Ecthesis, but imposed silence on the willsPrepared to be condemned at the Lateran of 649

The Roman works and the relics

The Chapel of Saint Venantius at the Lateran

The Chapel of Saint Venantius, near the Lateran baptistery, is linked to John IV and Theodore I. The official page of the archbasilica explains that it was built by the two popes to receive the relics of the Dalmatian martyrs Venantius and Domnius, and that its iconographic programme shows the Saviour, the Virgin, Peter, Paul, John the Baptist, John the Evangelist, the martyrs, John IV and Theodore.[60]

Theodore thus appears in a monument uniting several themes of his pontificate: Rome, the East, relics, baptism, martyrs and continuity with John IV.

Saint Valentine at the Milvian Bridge

The Liber Pontificalis attributes to Theodore the building of the basilica of Saint Valentine near the Milvian Bridge. Treccani corrects the interpretation: the church probably already existed since the 4th century, and Theodore rather brought to completion enlargement and restoration works begun as early as the time of Pope Honorius.[61]

This point is typical of a good Ignispedia article: keep the traditional fact, but do not repeat an old formula without nuance. Theodore is indeed linked to the shrine of Saint Valentine; he need not necessarily be made its absolute founder.

The translation of Primus and Felician

In 648, Theodore has the bodies of Saints Primus and Felician, buried in an arenarium of the Via Nomentana, transferred to Santo Stefano Rotondo on the Caelian.[62] Treccani stresses the importance of this act: it is the first translation of relics inside the city documented for Rome.

The fact is major for the history of Roman piety. Until then, veneration of the martyrs remains tied to the suburban cemeteries. With Theodore, holy bodies enter the urban liturgical space. The medieval Rome of relics begins to take shape here.

Saint Peter's and the small oratories

The Liber Pontificalis also attributes to Theodore gifts of silver for the confession of Saint Peter, as well as the building or restoration of oratories dedicated to Saint Euplus and Saint Sebastian.[63] These acts seem less spectacular than the Christological debates, but they proceed from the same logic: honouring Christ true man and true God in his saints, his martyrs, his visible Church and his worship.

Death and legacy

Burial at Saint Peter's

Theodore dies on 14 May 649 and is buried at Saint Peter's, in the portico of the pontiffs according to Treccani.[64] The date is immediately followed by a succession crisis: Martin I is consecrated on 5 July 649 without awaiting imperial confirmation, then convenes the Lateran Council in October.[65]

Theodore's death therefore does not interrupt his work. It hastens its completion. The Lateran of 649 will carry under Martin the dossier accumulated under Theodore.

A non-martyr pope, but preparer of a martyr pope

Theodore is not the martyr that Martin I will be. He does not suffer arrest, deportation and death in exile. But he prepares the line that will make that martyrdom possible: not receiving the Ecthesis, not accepting the Typos, not recognizing a patriarchal succession without doctrinal truth, not abandoning the resisters of Africa and Palestine.

His pontificate shows that visible ruptures often have a long invisible preparation. Martin I appears as the pope of the council; Theodore is the pope of the conditions that make the council necessary.

The Catholic meaning of a "secondary" pope

Theodore I belongs to the "Our other articles" sub-tree, but his pontificate touches a central point of the faith: Christ has a real human will, perfectly united to his divine will. Without this truth, the obedience of Christ, his Passion and our salvation become incomplete.

Theodore's story also corrects a simplistic reading of relations between Rome and the East. This pope is Greek, born in Jerusalem, and yet he defends Rome against a Greek imperial policy. The true fault line is therefore not ethnic or cultural; it runs between the orthodoxy of the Incarnation and the compromises that would silence it.

To go further

  • Pope Honorius I — the initial dossier of the ambiguous letters to Sergius.
  • Pope Severinus — the refusal of the Ecthesis before John IV and Theodore.
  • Pope John IV — Theodore's immediate predecessor and the first Roman clarifier of the dossier.
  • Pope Saint Martin I — Theodore's successor, pope of the Lateran of 649 and martyr of anti-monothelite resistance.
  • Third Council of Constantinople (680-681) — the ecumenical definition of the two wills and two operations of Christ.
  • The heresies of the first centuries — general framework of the Christological crises.

Notes and References

  1. Holy See, official entry "Teodoro I", re-read live on 4 October 2026 (HTML copy filed with the editorial correction dossier of 4 October 2026): "73° Papa della Chiesa Cattolica — Inizio pontificat 12.X, 24.XI.642 — Fine pontificat 14.V.649 — Nascita Gerusalemme". URL: https://www.vatican.va/content/vatican/it/holy-father/teodoro-i.html.

    1 10 16 24 57
  2. Horace K. Mann, "Pope Theodore I", The Catholic Encyclopedia, vol. 14, Robert Appleton Company, New York, 1912; New Advent transcription re-read live on 4 October 2026: pope from 642 to 649, Greek from Jerusalem, son of a bishop named Theodore (date of birth unknown), consecration on 24 November 642, refusal to recognize Paul without canonical deposition of Pyrrhus, reception then condemnation of Pyrrhus, excommunication of Paul (649), Typos of Constans II — with this honest qualification: "it is not certain whether Theodore lived long enough to anathematize it" — and burial at Saint Peter's on 14 May 649. Sources cited by the entry: Liber Pontificalis, I, 330ff., Duchesne ed. (Paris, 1886). URL: https://www.newadvent.org/cathen/14570a.htm.

    2 8 11 13 17 25 26 27 32 36 47 50 54
  3. Eugenio Susi, "Teodoro I", Enciclopedia dei Papi, Istituto della Enciclopedia Italiana Treccani, 2000, page re-read live on 4 October 2026 (HTML copy filed with the editorial correction dossier of 4 October 2026): Theodore given as born in Jerusalem and son of a bishop, come to Rome, consecrated on 24 November 642 after the death of John IV (12 October 642); Pyrrhus-Paul succession, letters to Constans II and Paul II, dispute of Carthage (July 645), reception of Pyrrhus, African synods, Stephen of Dor, Typos, mistreated apocrisiarii (altar of the Placidia palace torn down, exile of the apocrisiarius Anastasius to Trebizond), delegation decided by Constans II in the first months of 649 before the pope's death, burial on 14 May 649 at Saint Peter's "in porticu pontificum", Roman works (Saint Valentine, Primus and Felician in 648). The entry warns that the acts of the Lateran synod of 649 (Riedinger ed.) and the Liber Pontificalis must be used "with extreme caution" as retrospective readings. Exact edition references given by this entry's bibliography: Liber Pontificalis, Duchesne ed., I, Paris, pp. 331-337 (Pyrrhus reception formula p. 332; Saint Valentine, confessio and oratories p. 332); Acts of the Lateran of 649, Riedinger ed., ACO ser. II, t. I, Berlin, 1984, pp. 46, 54, 60, 66, 96, 98, 194, 196; Mansi, Sacrorum conciliorum collectio, t. X; Theophanes, Chronographia, de Boor ed., I, p. 331 (inquiry into the ink mingled with consecrated wine); burial "in porticu pontificum" after P. Mallio, Inscriptiones Christianae, II, no. 49, p. 211. URL: https://www.treccani.it/enciclopedia/teodoro-i_(Enciclopedia-dei-Papi)/.

    3 4 9 12 14 15 19 20 21 30 35 37 38 39 40 43 45 46 48 49 51 52 53 55 56 58 61 62 63 64
  4. See the Ignispedia article Pope Saint Martin I and the dossier of the Third Council of Constantinople for the later reception: the Lateran of 649 condemns the Ecthesis and the Typos, then Constantinople III solemnly defines the two wills of Christ. Acts of the Lateran of 649: Riedinger ed., ACO ser. II, t. I, Berlin, 1984 (African letters and Pyrrhus-Paul dossier: pp. 46, 54, 60, 66, 96, 98, 194, 196, after the Treccani bibliography).

    5 22 59 65
  5. Letter of Pope Agatho to the emperor, read at the 4th session of the Third Council of Constantinople, 15 November 680 ("Read at the Fourth Session, November 15"); English text verified live on 4 October 2026 on New Advent, Third Council of Constantinople: "that nothing be diminished from the things canonically defined, and that nothing be changed nor added thereto, but that those same things, both in words and sense, be guarded untouched". The English quotation in the body is taken from this published English text. URL: https://www.newadvent.org/fathers/3813.htm.

    6 23
  6. See the Ignispedia article Pope John IV (640-642), notably the sections on the Ecthesis, the defence of Honorius, the captives of Dalmatia/Istria and the Chapel of Saint Venantius at the Lateran.

    7 18 28 29
  7. See the Ignispedia article Third Council of Constantinople (680-681), which defines against monothelitism two natural wills and two natural operations in the one person of Christ.

    31 33 34 41
  8. Liber Pontificalis, life of Theodore I, I, p. 332 of the Duchesne edition (Paris, 1886): "ut sacerdotem regiae civitatis". Formula reported by Eugenio Susi, "Teodoro I", Enciclopedia dei Papi, Treccani, 2000 (page re-read live on 4 October 2026): after publicly handing over his profession of abjuration, Pyrrhus "fu invitato a prendere posto su un seggio episcopale accanto a T., che, stando alla narrazione del Liber pontificalis, lo accolse "ut sacerdotem regiae civitatis"". URL: https://www.treccani.it/enciclopedia/teodoro-i_(Enciclopedia-dei-Papi)/.

    42 44
  9. Archbasilica of Saint John Lateran, "The Chapel of Saint Venantius": chapel built by John IV and Theodore I for the relics of the Dalmatian martyrs, mosaic programme with the Saviour, the Virgin, the apostles, the martyrs and the two popes. URL: https://www.basilicasangiovanni.va/en/san-giovanni-in-laterano/battistero/la-cappella-di-san-venanzio.html.

    60