Eastern Orthodox Church (Greek Orthodox Church)

Eastern Orthodox Church (Greek Orthodox Church)
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Name	Eastern Orthodox Church (Greek Orthodox Church)
Main classification	Christian
Orientation	Eastern Christianity
Polity	Episcopal
Scripture	New Testament
Theology	Eastern Orthodox theology
Leader title	Primates and Synods
Language	Koine Greek, Modern Greek, Church Slavonic, Arabic
Headquarters	Constantinople
Founded	1st century
Founded place	Jerusalem, Antioch, Alexandria

Contents

Eastern Orthodox Church (Greek Orthodox Church) is one of the major bodies of Eastern Christianity tracing continuity to the Apostolic Age, centered historically in Constantinople and rooted in the traditions of Byzantium, Alexandria, Antioch and Jerusalem. It preserves liturgical, theological and canonical traditions shaped by the First Council of Nicaea, the Council of Chalcedon, the writings of Basil of Caesarea, John Chrysostom, and Gregory of Nazianzus, while interacting with institutions such as the Ecumenical Patriarchate of Constantinople, the Church of Greece, and the Greek Orthodox Archdiocese of America.

History

The development of the tradition involved the missionary work of the Apostle Paul, the establishment of sees in Ephesus, Corinth, Thessalonica, and Athens, and consolidation at ecumenical councils including the First Council of Nicaea, the First Council of Constantinople, the Council of Ephesus, and the Council of Chalcedon. Imperial and ecclesial relations were shaped by episodes like the Council of Constantinople (879–880), the policies of Justinian I, the iconoclast controversies associated with Leo III the Isaurian and vindicated at the Seventh Ecumenical Council (Second Council of Nicaea), and ruptures culminating in the East–West Schism with Pope Leo IX and Michael I Cerularius. Expansion and cultural exchange occurred through Byzantine missionary efforts to the Slavs, notably Saints Cyril and Methodius, leading to the establishment of national churches such as the Bulgarian Orthodox Church, the Serbian Orthodox Church, and the Russian Orthodox Church. Ottoman conquest affected institutional life after the fall of Constantinople (1453) under Mehmed II, while revival movements in the 19th and 20th centuries involved figures like Metropolitan Philaret and interactions with states such as Greece, Romania, and Cyprus.

Doctrinal formulations draw upon creeds from the First Council of Nicaea and the First Council of Constantinople, the mystical theology of Gregory Palamas, and the sacramental theology articulated by John of Damascus and Photios I of Constantinople. Key beliefs include the doctrine of the Holy Trinity defended against Arianism, Christological definitions established at Chalcedon responding to Nestorianism and Monophysitism, and the emphasis on theosis found in the writings of Maximos the Confessor and Symeon the New Theologian. Authority rests on the Pentarchy model embodied in sees such as Rome, Constantinople, Alexandria, Antioch, and Jerusalem, while canonical practices follow collections like the Nomocanon and canonical decisions from synods such as the Council in Trullo. The tradition also venerates icons affirmed by the Seventh Ecumenical Council and liturgical calendars like the Julian calendar and revised forms used by the Church of Greece and other autocephalous churches.

Worship centers on the Divine Liturgy of Saint John Chrysostom and the Divine Liturgy of Saint Basil the Great, with additional rites including the Liturgy of the Presanctified Gifts used during Great Lent. The liturgical year features cycles tied to the Paschalion observed for Pascha and feasts such as Nativity of Jesus, Theophany, and Dormition of the Theotokos, drawing on hymnography by Romanos the Melodist, John of Damascus, and liturgical reforms influenced by the Typikon. Sacraments (mysteries) like Baptism, Chrismation, Eucharist, Confession, and Holy Orders are celebrated in parish settings such as Hagia Sophia historically and contemporary cathedrals under hierarchs like the Ecumenical Patriarch of Constantinople and the Archbishop of Athens. Chant traditions include Byzantine chant and regional variants such as Slavic chant and Greek Byzantine music, transmitted through monasteries like Mount Athos and scriptoria preserving manuscripts such as those studied in Florence University and other academic centers.

The church polity is episcopal, organized into autocephalous and autonomous churches each governed by a synod of bishops and led by primates carrying titles like Patriarch, Metropolitan, or Archbishop. The Ecumenical Patriarchate of Constantinople has a primacy of honor recognized in the Phanariotes era and treaties such as the Treaty of Küçük Kaynarca influenced jurisdictional arrangements. Autocephaly issues have involved disputes among the Russian Orthodox Church, the Church of Cyprus, the Orthodox Church of Finland, and the Bulgarian Orthodox Church, adjudicated in councils and by synods with precedents from the Council of Chalcedon and the Council in Trullo. Canon law relies on collections like the Corpus Juris Civilis interactions, the Nomocanon of Photios, and the decisions of local synods, with monastic institutions such as Mount Athos retaining unique charters like the Avaton.

Cultural influence is evident in art, architecture, and education through monuments like Hagia Sophia, iconographic schools exemplified by Palaeologan Renaissance works and iconographers such as Theophanes the Greek and Andrei Rublev, and architectural forms manifest in churches across Greece, Bulgaria, Romania, and Russia. The tradition shaped national identities during movements such as the Greek War of Independence, the Bulgarian Revival, and the formation of modern states including Greece and Serbia, interacting with intellectuals like Adamantios Korais and clergy such as Germanos III of Old Patras. Educational and charitable institutions include seminaries linked to Athens University, hospitals founded under clerical auspices, and cultural centers preserving manuscripts in repositories like the National Library of Greece and monastic libraries on Mount Athos.

Contemporary challenges involve jurisdictional disputes exemplified by the 2018 granting of autocephaly to the Orthodox Church of Ukraine by the Ecumenical Patriarchate of Constantinople and the resulting break with the Russian Orthodox Church, debates over liturgical calendar reforms such as shifts from the Julian calendar to the Revised Julian calendar, and pastoral responses to modernity raised in dialogues with bodies like the World Council of Churches, the Roman Catholic Church through the Joint International Commission for Theological Dialogue between the Catholic Church and the Orthodox Church, and Protestant communions represented by the Lutheran World Federation. Social issues include engagement with secular states like Turkey over property and recognition, the protection of monastic enclaves such as Mount Athos from legal reforms, and internal movements addressing clergy discipline, laity participation, and diaspora communities in countries including the United States, Australia, and Canada.