The Eastern Catholic Churches

The notion of a Church of proper law (sui iuris)

The Code of Canons of the Eastern Churches (CCEO) — promulgated by Saint John Paul II on 18 October 1990 by the apostolic constitution Sacri Canones, and in force since 1 October 1991 — defines the sui iuris Church as follows:

"A group of Christian faithful united in accordance with the law by a hierarchy, which is expressly or tacitly recognised as sui iuris by the supreme authority of the Church, is called in this Code a Church sui iuris." — CCEO, canon 27 (translation from the Latin)^[6]

In practice, this means that a sui iuris Church possesses:

• its own hierarchy (patriarch, major archbishop, metropolitan or ordinary) recognised by the Holy See;
• its own liturgy inherited from one of the five great Eastern traditions;
• its own canon law, framed by the CCEO and by the particular constitutions voted by its synod;
• a spiritual and theological heritage distinct from the Latin tradition;
• full communion with the Pope, the pledge of its Catholic identity.

It is this last characteristic that distinguishes an Eastern Catholic Church from an Eastern Orthodox Church: visible ecclesial communion with the Successor of Peter.

Not to be confused with the Orthodox Churches

The most frequent mistake made by the general public is to identify "Eastern" with "Orthodox". This confusion is understandable — the liturgies are similar, the chants are close, the iconographies overlap — but it is doctrinally false. The Eastern Catholic Churches are not Orthodox Churches: they explicitly profess the primacy of jurisdiction of the Pope, the dogma defined at the First Vatican Council (1870) and reaffirmed by all subsequent magisterial teaching. Nor are they mere "Uniates" — a word formed from the Polish unia ("union"), the name of the act of Brest (1595–1596), which later came into often polemical use to designate the Churches united to Rome; the conciliar decree never uses it^[7][8].

This difference does not erase the real closeness: for Catholic doctrine, the Eastern Orthodox Churches retain a true priesthood, a true Eucharist, a true apostolic succession, which Vatican II recognises forcefully in the decree Unitatis Redintegratio^[11]. But they are not in full communion with the Roman See.

Why speak of "rites" and "Churches"?

The word "rite" first designates, in the ancient Latin tradition, the whole of the liturgical, theological, spiritual and canonical heritage of a particular Church. That is why people long spoke of the "Maronite rite", the "Coptic rite", the "Byzantine rite", designating both the liturgy and the community that celebrates it.

Since the CCEO, and even more since Orientale Lumen (1995), the official terminology has become more precise: we speak of liturgical traditions (five in number: Alexandrian, Antiochian or West Syriac, Armenian, Chaldean or East Syriac, Byzantine) and of sui iuris Churches (23 in number, including the Russian Catholic Church). Several sui iuris Churches may share the same liturgical tradition: thus 14 Churches belong to the Byzantine tradition, but they form distinct Churches, each with its patriarch or major archbishop, its synod and its historic territory^[12].

The CCEO and the Annuario Pontificio list 23 sui iuris Churches distributed across the five great liturgical traditions stemming from the first Christian millennium^[13]. The table below gives an overview. It does not exhaust all the complexity (some Churches have several historic jurisdictions, some diasporas are considerable), but it makes it possible to grasp at a glance what the expression "Eastern Catholic Churches" designates.

The figures are 2022–2023 estimates from the Annuario Pontificio and diocesan censuses compiled by the Catholic Near East Welfare Association (CNEWA), a pontifical agency^[14][15]. They vary considerably from one source to another, particularly for the diasporas.

The Alexandrian tradition

Stemming from the liturgy of Saint Mark at Alexandria, this liturgical tradition is carried by the three Eastern Churches of North-East Africa: Coptic Catholic (Egypt), Ethiopian Catholic and Eritrean Catholic. They still use the Alexandrian rite today (in Coptic, Ge'ez and Arabic) — a eucharistic liturgy of great hieratic beauty, the direct heir of the great Alexandrian doctors (Athanasius, Cyril).

The Coptic Catholic Church, in full communion with Rome since 1741, has a patriarchate seated in Cairo. It is numerically small (fewer than 200,000 faithful) within a Coptic community that is mostly non-Chalcedonian (Coptic Orthodox Church), but it plays a vital role in the dialogue between Rome and the African East^[16].

The Antiochian tradition (West Syriac)

Three sui iuris Churches belong to it: the Maronite, the Syriac Catholic and the Syro-Malankara. They share the Antiochian or West Syriac liturgy celebrated in Syriac (a late form of Aramaic, the language of Christ) and in Arabic.

The Maronite Church is, by itself, the most numerous of all the Eastern Catholic Churches of the Levant, with about 3.5 million faithful, more than two-thirds of them in the diaspora (North America, Latin America, Australia, France)^[17]. It has the unique particularity of being the only Eastern Catholic Church without an Orthodox counterpart: in its history it has known no major schism with Rome^[18]. We return to this in detail below.

The Armenian tradition

The Armenian Catholic Church, in full communion with Rome since 1742, is one of the oldest distinct liturgical traditions of Christianity. Armenia was, in 301, the first kingdom in the world officially to embrace Christianity, through the evangelisation of Saint Gregory the Illuminator. Its rite, celebrated in classical Armenian, is related to the Antiochian tradition, but distinct.

The Armenian Catholic patriarchate, known as "of Cilicia", is seated at Bzommar near Beirut. The community numbers about 740,000 faithful scattered across Armenia, Lebanon, Syria, France, the United States and Latin America — a population profoundly marked by the Armenian genocide of 1915^[19].

The Chaldean tradition (East Syriac)

Two sui iuris Churches are its heirs: the Chaldean Catholic Church (issuing in 1553 from the Church of the East, wrongly called Nestorian by the ancients) and the Syro-Malabar Church of India, descended from the Saint Thomas Christians.

Their principal eucharistic liturgy, the "Holy Qurbana", originally used the Liturgy of Addai and Mari, one of the oldest preserved Christian anaphoras — remarkable in that it contains no institution narrative. On 17 January 2001, the Congregation for the Doctrine of the Faith recognised its eucharistic validity; on that basis, Guidelines for reciprocal admission to the Eucharist between the Chaldean Church and the Assyrian Church of the East, approved on 20 July 2001 and promulgated on 26 October 2001, regulate eucharistic hospitality in the diaspora^[20]. This is not a general dispensation, but a precise arrangement for reciprocal admission.

The Byzantine tradition

It is by far the most numerous in sui iuris Churches: fourteen Churches belong to it. The Byzantine liturgy — that of Saint John Chrysostom, completed by that of Saint Basil for solemn days — is shared by all the Byzantine Christians of the world, whether Catholic or Orthodox. Depending on the Church, it is celebrated in Greek, Arabic, Church Slavonic, Ukrainian, Romanian, Hungarian, Albanian or Italo-Albanian^[21].

Among the Byzantine Catholic Churches, a traditional distinction is made between:

• the Greco-Arab branch (Melkites — Syria, Lebanon, Egypt);
• the Slavic branch (Ukrainians, Ruthenians, Belarusians, Slovaks, Russians);
• the Latino-Eastern branch (Italo-Albanians, Albanians, Hungarians, Romanians, Croats-Serbs, Macedonians, Bulgarians, Greek Catholics).

The history of the Eastern Catholic Churches is not a single history but a succession of particular unions between a local Eastern Church and the Roman See, at very different dates and in very different contexts. Some unions are ancient and unbroken (Maronites); others result from conciliar efforts (Florence); still others come from regional movements of the 16th–19th centuries in complex political and missionary contexts (Brest, Diamper, Antioch).

The Maronites: a fidelity presented as unbroken

The Maronite Church presents itself, since the 17th century, as the only Eastern Catholic Church never to have broken communion with Rome^[22]. This claim, known as the "thesis of perpetual catholicity", is the subject of serious historiographical debate — some historians see in it a late reconstruction, others confirm at least doctrinal continuity. Historians discuss the available sources on this point, without any magisterial condemnation of the Maronites as a Church for heresy or schism having been established^[23].

The spiritual founder of this tradition is Saint Maron (c. 350-410), a Syrian monk, ascetic and worker of miracles, whose Life is known through the Religious History of Theodoret of Cyrrhus (c. 444). A community of disciples forms around his hermitage in Second Syria; a great monastery of Beit Maron will be built near Hama in the 5th century. When the Arab invasion (7th century) and then the Christological troubles weaken the community, its faithful gradually take refuge in the Mount Lebanon range, where they progressively build the Maronite Church in the institutional sense — around a patriarchate from 685, under John Maron^[24].

Contact with Rome is attested particularly clearly from the 12th century, after the arrival of the Crusaders in Lebanon. In 1182, according to the account of the contemporary chronicler William of Tyre, the Maronite patriarch and his bishops, representing some 40,000 faithful, make a profession of faith and an oath of fidelity to Pope Alexander III into the hands of the Latin Patriarch of Antioch^[25]. From the Synod of Mount Lebanon in 1736, presided over by the pontifical legate Joseph Simon Assemani, Maronite discipline and liturgy receive their modern form. This canonical assembly remains, to this day, a reference text for the Maronites and a model of Romano-Syriac dialogue^[26].

The Maronite Church has been led since 15 March 2011 by Patriarch Bechara Boutros Rai, created cardinal by Benedict XVI on 24 November 2012; each year at Bkerke he convenes the synod of Maronite bishops^[27].

The Saint Thomas Christians and the Synod of Diamper (1599)

The Syro-Malabar Church of India, the second largest Eastern Catholic Church in the world with its 4.5 million faithful, is the direct heir of the Saint Thomas Christians: the (very ancient and much contested by modern historians) tradition attributes their evangelisation to the apostle Saint Thomas, who landed at Cranganore (Kerala) in 52 AD^[28].

Whatever the historical status of this apostolic tradition, it is certain that a structured Syriac Christian community existed in Kerala at least since the 6th century, in relation with the Church of the East (seated in Mesopotamia). This Malabar Church remained isolated for centuries, keeping the East Syriac liturgy, the Syriac calendar, and its own organisation around the archdeacon — a local, hereditary dignitary.

The arrival of the Portuguese in Kerala (1498) overturns this world. The Latin Archbishop of Goa, Aleixo de Menezes (1559-1617), undertakes in the last decade of the 16th century a vast operation to submit the Malabar Christians to Roman authority via Goa. The Synod of Diamper (Udayamperoor), which he presides over from 20 to 26 June 1599, is its culminating point: before 153 local priests and 660 lay representatives, Menezes has decrees approved which condemn local usages judged "Nestorian" and profoundly Latinise the liturgy^[29]. The decrees order the surrender of suspect Syriac books: during the enforcement tour (autumn 1599), those judged heretical are delivered to the flames^[30].

This forced assimilation provokes, half a century later, one of the greatest traumas in the Christian history of India: on 3 January 1653, thousands of Malabar Christians gather at Mattancherry, near Cochin, around a great stone cross — the Coonan Cross. Holding a rope tied to the cross, they collectively swear to break all obedience to the Latin missionaries and to the Archbishop of Cranganore: this is the Coonan Cross Oath. The majority of the Saint Thomas Christians then separates from Rome; they will subsequently form several Churches (Jacobite, Mar Thoma, independent)^[31].

A part nevertheless remains in communion with Rome; it is this part which will constitute the modern Syro-Malabar Church, canonically restored by Leo XIII in 1887 and completely restructured as a sui iuris Church by Saint John Paul II on 16 December 1992 with the rank of major archiepiscopate^[32].

The Council of Florence (1439): the aborted ecumenical union

On 6 July 1439, the Council of Ferrara-Florence solemnly proclaims, by the bull Laetentur caeli, the union of the Greeks with Rome. The Byzantine emperor John VIII Palaiologos, Patriarch Joseph II and the Eastern delegation accept the central doctrinal points: the procession of the Holy Spirit from the Father and the Son as from a single principle; the legitimacy of the Byzantine use as of the Latin; the doctrine of purgatory; and the universal primacy of the Successor of Peter^[33].

Florence did not remain without posterity: a century and a half later, when the Ruthenians negotiate the Union of Brest (1595–1596), the compromise is modelled on Florence. The "33 articles" presented by the Ruthenian bishops to Rome largely take up the doctrine of Florence, adding liturgical guarantees: no insertion of the Filioque into the Creed, maintenance of the married clergy, the Julian calendar at the outset, veneration of the Eastern saints — all that forms the Byzantine identity^[34].

The Union of Brest (1595–1596)

The Union of Brest is the juridical birth certificate of the most numerous Eastern Catholic Church of the 20th century, the Ukrainian Greek Catholic Church.

At the end of the 16th century, the Metropolitan of Kyiv, Galicia and all Rus', Michael Rohoza, and several bishops of the Polish-Lithuanian Commonwealth judge the situation of their Ruthenian Orthodox Church unbearable: declining discipline, lay interference, isolation after the fall of Constantinople (1453). Supported by King Sigismund III Vasa, they decide to enter into communion with Rome while keeping their Byzantine rite and proper law^[35].

Four bishops sign a declaration of intent as early as 1590: Kyrylo Terletskyi (Lutsk), Leonti Pelchytskyi (Pinsk), Dionisiy Zbyruiskyi (Chełm) and Hedeon Balaban (Lviv). In December 1595, two of them, Terletskyi and Hypatius Pociej, travel to Rome; Pope Clement VIII ratifies the union by the bull Magnus Dominus on 23 December 1595. A synod gathered at Brest-Litovsk in October 1596 confirms the act on the Ruthenian side — but a significant part of the clergy and nobility refuses, forming a parallel anti-uniate synod. The break is complete: alongside the Ruthenian Orthodox, a new Greek Catholic Church appears, keeping the Byzantine rite and recognising the primacy of the Pope.

This union is extended in 1646 by the Union of Uzhhorod: on 24 April 1646, 63 priests of the eparchy of Mukachevo (Carpathians, then divided between Transylvania and Habsburg Hungary) profess communion with Rome in the chapel of Uzhhorod Castle, keeping the Byzantine rite^[36]. The act — whose original document was rediscovered in 2016 — is gradually received throughout the eparchy at the beginning of the 18th century: it is the origin of the Ruthenian, Slovak and Hungarian Greek Catholic Churches. Mukachevo thus designates the eparchial seat, not a distinct union.

The union of Antioch: birth of the Greek-Melkite Catholics (1724)

At Antioch, union with Rome is born of an internal division within the Melkite Orthodox patriarchate — a term which historically designates the Christians of Byzantine tradition in the Near East (Syria, Lebanon, Egypt).

In 1724, the patriarchal see of Antioch is vacant. The pro-Roman faction, formed above all in Damascus, elects Cyril VI Tanas as patriarch. The Patriarch of Constantinople Jeremias III, hostile to unions with Rome, denounces this election and excommunicates Cyril. The latter then turns to Rome: Pope Benedict XIII officially recognises him on 13 August 1729 as Patriarch of Antioch, in full communion with the Holy See. This is the founding act of the Greek-Melkite Catholic Church, which will take on considerable importance in the 19th century, notably under the great patriarch Maximos III Mazloum^[37].

The Melkite patriarchal see is today in Damascus; the current patriarch, Youssef Absi, has been in office since 2017. The Greek-Melkite Catholic Church considers itself "Orthodox in communion with Rome" — a formula common among Melkite theologians to stress that their union with the Holy See implies no renunciation of the Byzantine heritage^[38].

Leo XIII and Orientalium Dignitas (1894)

Before Vatican II, the great founding text of Catholic doctrine on the Eastern rites is the apostolic constitution Orientalium Dignitas promulgated by Pope Leo XIII on 30 November 1894. A landmark text, often described as the "Magna Carta" of the Eastern Catholic Churches^[39].

The context is precise: in the 19th century, under the impetus of part of the Latin clergy and of certain missionary congregations, a tendency towards the Latinisation of Eastern faithful had developed. Many Latin bishops regarded Eastern usages as "inferior", "provisional" or "in need of civilising". Conversion to Latin ways = spiritual elevation: such was the mentality denounced by Leo XIII as an ecclesial sin.

Orientalium Dignitas overturns this logic. Leo XIII forcefully affirms:

• the equal dignity of the Eastern rites and the Latin liturgy;
• the strict prohibition for an Eastern believer to pass to the Latin rite without the express authorisation of the Holy See;
• the prohibition for a Latin priest to push an Eastern Christian to change rite;
• the obligation for Latin missionaries in Eastern lands scrupulously to respect the local rite.

This last point is made concrete: Leo XIII explicitly annuls previous facilities granted to certain Latin missionaries to absorb Eastern Christians into their own jurisdictions^[40]. The Latin Pope thus chooses to curb Latinisation from within the Catholic Church herself — a rare gesture, heavy with meaning.

Vatican II: the decree Orientalium Ecclesiarum (21 November 1964)

On 21 November 1964, at the same time as the dogmatic constitution Lumen Gentium and the decree Unitatis Redintegratio, the Second Vatican Council promulgates the decree Orientalium Ecclesiarum on the Eastern Catholic Churches. A short text (30 articles) but of immense doctrinal scope, it synthesises and extends Leo XIII.

Its central theses:

"The holy Catholic Church, which is the Mystical Body of Christ, is made up of the faithful who are organically united in the Holy Spirit by the same faith, the same sacraments and the same government, and who, uniting in various groups held together by a hierarchy, form particular Churches or rites." — Vatican II, Orientalium Ecclesiarum, n. 2^[41]

"The Churches of the East, like those of the West, have the right and the duty to govern themselves according to their own particular disciplines." — Vatican II, Orientalium Ecclesiarum, n. 5^[42]

The Council:

• reaffirms the equality of dignity of the rites (n. 3);
• restores the patriarchal institution in all its juridical force (n. 7-11) — an Eastern patriarch is not a "sub-bishop" under the control of a Roman dicastery but the true head of his Church;
• asks Eastern faithful faithfully to preserve their heritage (n. 6) — that is, to resist Latinisation, sometimes even against pressure from their own pastors influenced by the dominant Latin culture;
• carefully opens the possibility of communicatio in sacris with the Orthodox Churches for certain sacraments in case of necessity (n. 26-29).

Saint John Paul II: Orientale Lumen and the "two lungs" (1995)

On 2 May 1995, for the centenary of Orientalium Dignitas, Saint John Paul II publishes the apostolic letter Orientale Lumen — "The Light of the East". A programmatic text of great literary beauty, the fruit of his deep Slavic-Byzantine formation and his long-standing admiration for Eastern spirituality^[43].

The most famous metaphor associated with John Paul II on this subject — which predates this letter — is that of the "two lungs": the Church must breathe with her two lungs, Eastern and Western. The image goes back to the Russian writer Vyacheslav Ivanov, who used it as early as 1926; John Paul II, who says he himself "used it several times", solemnly takes it up in the encyclical Ut unum sint (25 May 1995):

"The Church must breathe with her two lungs!" — Saint John Paul II, Ut unum sint, n. 54 (25 May 1995)^[44]

Orientale Lumen develops this image in three movements: (1) the Pope implores all Catholics to know, honour, preserve and promote the Eastern heritage; (2) he describes Eastern monasticism, the prayer of the heart, mystical theology as precious gifts for the whole Church; (3) he invites to a patient dialogue with the Orthodox, relying on the Eastern Catholics, "living witnesses" of this common breathing^[45].

The Code of Canons of the Eastern Churches (CCEO, 1990)

From the juridical point of view, the great structuring text of the post-conciliar era is the CCEO. Promulgated by Saint John Paul II by the apostolic constitution Sacri Canones on 18 October 1990, in force since 1 October 1991, it comprises 1,546 canons distributed in 30 titles, plus preliminary provisions^[46].

The CCEO is, for the Eastern Catholic Churches, the juridical equivalent of the 1983 Latin Code of Canon Law. It lays down:

• the hierarchical structure: patriarchs, major archbishops, metropolitans, ordinaries;
• the rights and obligations of Eastern faithful;
• the sacramental discipline proper to the East (for example, the three sacraments of initiation — baptism, chrismation, Eucharist — administered together to newborns);
• the rules of communicatio in sacris with the Orthodox;
• synodal governance: for the Eastern Churches, the synod of bishops is not merely consultative, but holds broad governmental powers.

One essential doctrinal point: the CCEO explicitly leaves each sui iuris Church the right to promulgate its own particular constitutions, which complete and adapt the common law to the culture and history of the local Church. This is the juridical application of the conciliar principle: "the right and the duty to govern oneself according to one's own particular disciplines" (Orientalium Ecclesiarum, n. 5)^[47].

Seven sacraments, the same but different

The Eastern Catholic Churches celebrate the same seven sacraments as the Latin Church, with the same validity. But their concrete administration sometimes differs markedly, because they have kept the usage of the first millennium which Latin practice, for its part, transformed.

• Baptism is administered by triple immersion (and not by pouring alone), immediately followed by chrismation (our confirmation) and first communion, even for newborns. The trilogy baptism-chrismation-Eucharist remains intact, as in the whole pre-medieval Church.
• The Eucharist is celebrated according to the rite's own liturgy (John Chrysostom, Basil, Mark, Maron, Addai-and-Mari, Gregory the Illuminator), often in a sacred liturgical language (Syriac, Coptic, Greek, Church Slavonic, Armenian), with intense veneration of the icon.
• Marriage of priests is authorised in most Eastern Catholic Churches for men married before ordination. Once ordained, a priest can no longer marry; and only an unmarried man can be ordained bishop^[48].

The married clergy: an ancient tradition recognised by Rome

Canon 373 of the CCEO states:

"The state of married clerics, a venerable practice in the primitive Church and the tradition of the Eastern Churches through the centuries, is to be held in honour."^[49]

This discipline was solemnly reaffirmed by Leo XIII in Orientalium Dignitas, then by Vatican II in Presbyterorum Ordinis (n. 16)^[50]. For centuries, a Maronite, Melkite or Ukrainian Greek Catholic priest could be married — a practice sometimes misunderstood by Latin faithful, and even restricted in the United States at the beginning of the 20th century (a decree of the Holy Office of 1929 had forbidden the ordination of married Eastern priests there, a measure abrogated only in 2014 by Pope Francis^[51]).

An iconography that safeguards the holy Image

The icon is not, in the Eastern tradition, a mere teaching aid: in the theological sense it is a sacramental — not a sacrament —, a place of encounter with the mystery it depicts. The Second Council of Nicaea (787) — the seventh ecumenical council, recognised by Catholics and Orthodox — defined it in dense terms:

"The honour paid to the image goes back to the prototype, and whoever venerates an image venerates the person depicted in it." — Nicaea II, definition of the 7th session (13 October 787)^[52]

The Eastern Catholic Churches — particularly the Byzantine, Coptic and Ethiopian — still live this spirituality of the icon intensely. The great Syro-Malankara shrine of Kerala as well as the Cathedral of the Resurrection in Kyiv are decorated according to the strict canons of traditional iconography, with no concession to Latin pictorial taste.

A mystical theology of deification

The most precious spiritual contribution of the Eastern Churches to the whole Church, according to Orientale Lumen, is their teaching on divinisation (theosis) — the idea that the Christian life consists in really participating in the divine nature (2 Pet 1:4) without confusion or absorption. This doctrine, codified by the Greek Fathers (Athanasius, Cyril of Alexandria, Maximus the Confessor) and formalised among the Byzantines by Gregory Palamas in the 14th century, is not absent from the Latin tradition — Saint Thomas Aquinas knows it and cites it — but it was less developed there^[53].

"God became man so that man might become God." — Saint Athanasius of Alexandria, De Incarnatione §54 (c. 320)^[54]

For Eastern Catholics, the eucharistic liturgy is not only a "memorial" or a "banquet": it is the liturgical epiphany of deification, the progressive transfiguration of man into a living image of the glorified Christ. This spiritual inflection today nourishes the ascetic and monastic renewal of the whole Catholic world, Latin included.

The pseudo-synod of Lviv (1946) and the clandestine Ukrainian Church

The most tragic event of the 20th century for the Eastern Catholic Churches is the forced suppression, under Stalinist pressure, of the Greek Catholic Churches of Ukraine and Romania.

From 8 to 10 March 1946, at Lviv (Lvov), a pseudo-synod convened by the Soviet authorities "proclaims" the annulment of the Union of Brest and the dissolution of the Ukrainian Greek Catholic Church, its faithful having to be "reintegrated" into the Russian Orthodox Church^[55]. All Ukrainian Catholic bishops had been arrested in April 1945; no Greek Catholic bishop is present at this pseudo-synod, contrary to canonical requirements. The deception is total, but the result is juridically effective on the Soviet side: the largest Eastern Catholic Church of the 20th century is banned and goes underground.

The primate, Josyf Slipyj (1892-1984), Metropolitan of Lviv, major archbishop, is imprisoned from April 1945. He will spend 18 years in the Soviet camps (1945-1963), Siberia, Mordovia, Kazakhstan — tortured, isolated, but unyielding. His liberation, obtained at the beginning of 1963 through the combined intervention of Pope John XXIII and American President John F. Kennedy with Khrushchev^[56], brings him to Rome on 9 February 1963; he will be created cardinal on 22 February 1965 by Paul VI, will take part in the last sessions of Vatican II, and dies in Rome in 1984 — a witness, doctrinal and personal, that ranks among the greatest of 20th-century Catholic fidelity^[57].

Meanwhile, in Soviet Ukraine, hundreds of priests and dozens of bishops continue their ministry clandestinely: ordinations in the middle of the night, Eucharist in the homes of the faithful, a secret seminary. This clandestine Ukrainian Church remained faithful for 43 years. It will not be re-legalised until December 1989, under Gorbachev^[58]. The patriarchal seat, transferred to Kyiv in 2005, is today led by Major Archbishop Sviatoslav Shevchuk (since 23 March 2011)^[59].

The Christians of the Middle East: Maronites, Melkites, Chaldeans, Syriacs

In the Middle East, the Eastern Catholic Churches have endured permanent demographic and political pressure since the 20th century. The Maronites of Lebanon were long the majority Christian community; they have become a minority following the Lebanese civil war (1975-1990) and then massive emigration to North America and Australia. The Melkites of Syria, once numerous in Damascus and Aleppo, have been decimated by the Syrian civil war (2011 and the following years).

The most dramatic situation is that of the Chaldean and Syriac Catholics of Iraq. In August 2014, the advance of the Islamic State emptied the Nineveh Plain of its Christians: Mosul, Qaraqosh, Bartella, Tellskuf, where Aramaic was still spoken as a mother tongue in the 21st century, were deserted. The Chaldean Catholic Patriarch Louis Raphael Sako (2013-2026) made the return of displaced faithful his principal struggle^[60]; after his resignation submitted to Pope Leo XIV in March 2026, the Chaldean synod elected on 12 April 2026 Amel Shamon Nona, who took the name of Paul III, installed in Baghdad on 29 May 2026^[61]. Catholic teaching rests on the precise theological conviction that these martyrs — killed for their faith and their belonging to the Christian community — belong to the great contemporary martyrology to which Saint John Paul II had devoted part of the letter Tertio Millennio Adveniente (1994).

The Eastern diaspora and the pastoral challenge

All the large Eastern Catholic Churches today experience a considerable diaspora. The Maronites count nearly two-thirds of their faithful outside Lebanon (United States, Brazil, Argentina, Australia, France); the Ukrainian Greek Catholics are numerous in Canada (province of Alberta), the United States and Brazil; the Syro-Malabars emigrate massively to the Gulf States, the United States and Europe.

This diaspora poses a major pastoral challenge: how to maintain Eastern liturgical and spiritual identity in a majority Latin environment? The risk of Latinisation through attrition — faithful switching to the nearest Latin parish, mixed marriages, children educated in Latin Catholic schools — is today as present as it was in the 19th century, but in a more diffuse form, harder to combat.

It is to meet this challenge that eparchies and apostolic exarchates are created all over the Latin Catholic world. In the United States, for example, there are 18 Eastern eparchies belonging to 10 sui iuris Churches — Ukrainian, Ruthenian, Melkite, Syriac, Maronite, Armenian, Romanian, Syro-Malankara, Chaldean and Syro-Malabar — each with its own bishop or exarch and its own parishes^[62].

The major archiepiscopate of the UGCC

The Ukrainian Greek Catholic Church is today led by Sviatoslav Shevchuk (born 1970), elected Major Archbishop of Kyiv-Halych on 23 March 2011 at the age of 40 — the youngest head of an Eastern Catholic Church at the time of his election. A theologian trained in Buenos Aires (where he had known the future Pope Francis), he today bears the double burden of spiritually accompanying Ukrainian faithful in the war triggered by the Russian invasion in 2022, and of representing Catholic fidelity in a politically and religiously complex Ukraine^[63].

The UGCC officially numbers about 4.5 million faithful worldwide, with a major concentration in western Ukraine (oblasts of Lviv, Ivano-Frankivsk, Ternopil)^[64]. The title of "patriarch" is still canonically refused to it by Rome — a subject of permanent debate between Kyiv, Moscow and the Vatican since the 1960s — but the rank of major archiepiscopate confers on it practically all patriarchal prerogatives.

Comparative demography of the Eastern Catholic Churches (2023)

As an order of magnitude, here is the distribution of the eight most numerous Churches — the first six of which alone account for nearly 85% of the total:

The precise figures in the table are 2022–2023 estimates from the Annuario Pontificio compiled by CNEWA^[65][66]. They vary considerably from one source to another, particularly for the diasporas which the Eastern eparchies do not always count.

The challenge of Latinisation

The risk of Latinisation — that is, the gradual adoption of Latin liturgical, disciplinary or spiritual usages by Eastern faithful — remains, in 2026, the principal identity challenge of all the Eastern Catholic Churches. It takes several forms:

• liturgical: shortening of the Divine Liturgy, abandonment of the old calendar, translation into the modern vernacular to the detriment of the sacred language;
• disciplinary: gradual alignment with Latin canon law despite the CCEO, suspicion towards the married clergy;
• architectural: building churches in the modern Latin style to the detriment of Eastern iconographic grammar;
• spiritual: dilution of proper devotions (prayer of the heart, long fasts, veneration of the Fathers) in favour of globalised Latin devotions.

Orientalium Dignitas (1894), Orientalium Ecclesiarum (1964), Orientale Lumen (1995) and the CCEO (1990) seek to curb this tendency, but concrete pastoral experience shows that it continues. The challenge thus shifts from exterior persecution to interior erosion: the gradual dilution of proper usages on contact with the majority Latin milieu.

The ecumenical dialogue with Orthodoxy

The Eastern Catholic Churches occupy a singular position in Catholic-Orthodox dialogue. On the one hand, they are, by their very existence, the living sign that full communion with Rome is possible without renouncing the Eastern heritage — and thus an encouragement to reunion. On the other hand, they are sometimes perceived by the Orthodox as the wound of uniatism: a Roman "Trojan horse" in the Eastern world, a competing presence recalling the asymmetry between Rome and Constantinople^[67].

The Balamand Declaration (Lebanon, June 1993), adopted by the Joint International Commission for Theological Dialogue between Catholics and Orthodox, attempted to ease this point by explicitly condemning the "method of uniatism" as henceforth unsuitable: the aim is no longer to draw Orthodox to Rome individually; the aim is the return to the full communion of whole Churches^[68]. This position, formally received, has nevertheless never been understood as calling into question the legitimate existence of the Eastern Catholic Churches — explicitly affirmed by the text (n. 3)^[69].

The visible unity between Rome and the Eastern Orthodox Churches remains, as John Paul II wrote in Ut unum sint, a "holy ambition" not yet accomplished. But it is conceivable, because Eastern Catholics are already its concrete proof.

• The Great Schism of the East — the rupture between Rome and Constantinople (1054) which the Eastern Catholic Churches witness can be overcome.
• The Fall of Constantinople (1453) — the event which seals the Byzantine estrangement and partly explains the context of the later unions.
• Responses to Orthodoxy — a synthesis of current doctrinal questions (primacy, Filioque, Eucharist) between Catholics and Orthodox.
• The Council of Florence (1438-1445) — the ecumenical council of union, whose bull Laetentur caeli still serves as a reference for later unions.
• The Second Vatican Council (1962-1965) — the council whose decree Orientalium Ecclesiarum is the great founding text of Catholic doctrine on the Eastern Churches.
• The Chinese Rites Controversy — another major dossier of Catholic inculturation, parallel to the Eastern unions.