Orthodox Church (Eastern Orthodox)

Orthodox Church (Eastern Orthodox)
Name	Orthodox Church (Eastern Orthodox)
Caption	Interior of Hagia Sophia, historically central to Constantinople and Ecumenical Patriarchate of Constantinople
Main beliefs	Nicene Creed, Holy Trinity, Theotokos
Theology	Eastern Christian theology, Patristics, Byzantine theology
Liturgy	Divine Liturgy, Byzantine Rite
Headquarters	Ecumenical Patriarchate of Constantinople
Leader	Ecumenical Patriarch of Constantinople
Language	Koine Greek, Church Slavonic, Georgian language, Romanian language
Founded	First Council of Nicaea, Council of Chalcedon
Area	Eastern Europe, Balkans, Caucasus, Middle East, Diaspora

Contents

Orthodox Church (Eastern Orthodox) The Orthodox Church (Eastern Orthodox) is a communion of autocephalous churches tracing institutional continuity to the Early Christian Church, the Apostolic Age, and the Byzantine Empire. It centers its identity on the Nicene Creed, the conciliar tradition of the Seven Ecumenical Councils, and liturgical practice derived from the Byzantine Rite and Eastern Christian liturgy. The communion is organized without a single papal figure, historically coordinated by the Ecumenical Patriarchate of Constantinople and shaped by relations with Moscow Patriarchate, Church of Greece, and other national churches.

History

The historical development of the Orthodox Church involves events and figures like the First Council of Nicaea, the Council of Constantinople (381), the Council of Ephesus, the Council of Chalcedon, and schisms culminating in the East–West Schism of 1054. Influences from Apostle Paul, Apostle Peter, and Apostle John informed early doctrine while leaders such as St. Athanasius of Alexandria, St. Basil the Great, St. Gregory of Nazianzus, and St. John Chrysostom shaped Patristics. The Byzantine Empire furnished theological, liturgical, and artistic forms preserved in centers like Constantinople, Antioch, Alexandria, and Jerusalem. Later developments include the rise of the Kievan Rus' conversion under Prince Vladimir the Great, formation of the Russian Orthodox Church, establishment of the Serbian Orthodox Church, the Bulgarian Orthodox Church restoration, and the Autocephaly of the Orthodox Church of Albania. Contacts and conflicts with the Ottoman Empire, encounters with Catholic Church, and reforms during the Council of Florence and responses to modernity shaped subsequent history. The 20th century saw persecution in Soviet Union, diaspora growth in United States, and contemporary autocephaly disputes involving the Orthodox Church of Ukraine and the Ecumenical Patriarchate.

Orthodox theology rests on the Nicene Creed upheld at the First Council of Nicaea and First Council of Constantinople, the doctrine of the Holy Trinity articulated by St. Athanasius of Alexandria and Athanasius' writings, and Christological definitions from the Council of Chalcedon. The tradition emphasizes Theosis as taught by Gregory Palamas and developed in Byzantine theology and Patristics by figures like Maximus the Confessor, John of Damascus, and Symeon the New Theologian. Sacramental life is grounded in the Holy Mysteries including Baptism, Chrismation (anointing), Eucharist, and Holy Orders interpreted through the theology of St. Cyril of Alexandria and liturgical texts attributed to St. John Chrysostom. Moral and ascetical teachings derive from monastic exemplars such as St. Anthony the Great, Pachomius, St. Sergius of Radonezh, and the Desert Fathers.

Worship centers on the Divine Liturgy often according to the Liturgy of St. John Chrysostom and the Liturgy of St. Basil the Great. Liturgical language and chant traditions include Byzantine chant, Znamenny chant, Church Slavonic, Greek, Georgian, and Arabic in Antiochian usage. Sacred spaces like Hagia Sophia, Mount Athos, Monastery of Saint Catherine, and Saint Sava Church exemplify architectural and iconographic programs following theological patterns from Iconoclasm controversies and the restoration at the Seventh Ecumenical Council (Nicaea II). The iconography tradition includes icons of Christ Pantocrator, Theotokos of Vladimir, Hodegetria, and techniques codified by painters in Byzantine art, Russian icon painting, and workshops influenced by Palaeologan Renaissance.

The church is organized into autocephalous and autonomous hierarchies led by bishops, metropolitans, archbishops, and patriarchs, with notable sees like the Ecumenical Patriarchate of Constantinople, Moscow Patriarchate, Patriarchate of Alexandria, Patriarchate of Antioch, and Patriarchate of Jerusalem. The role of the Ecumenical Patriarch of Constantinople has been shaped through interactions with emperors such as Justinian I and events like the Photian Schism. Canonical order is informed by collections like the Canons of the Apostles, the decisions of councils such as the Council in Trullo, and legal formulations influenced by Nomocanon compilations. Monastic governance on Mount Athos follows the Holy Community model with abbots like those in Great Lavra and rules attributed to St. Benedict only indirectly compared, while episcopal election processes vary across churches like the Church of Greece and Russian Orthodox Church Outside Russia.

Daily and seasonal practices include the Divine Liturgy, Lenten fasts observed according to the Great Lent calendar, festal cycles honoring Pascha, Nativity of Jesus, Feast of the Transfiguration, and veneration of relics and icons such as Our Lady of Kazan. Private devotions include the Jesus Prayer, hesychasm promoted by Gregory Palamas, the use of the Prayer rope (komboskini), and pilgrimages to sites like Mount Athos, Tinos, Monastery of Hosios Loukas, and Monastery of Saint John the Theologian. Sacramental practices emphasize confession, anointing of the sick, and holy communion as central to communal and private piety, with liturgical calendars shaped by Paschalion computations and variations among Eastern Orthodox liturgies.

Relations include historical and contemporary dialogues with the Roman Catholic Church, marked by moments like the Council of Florence and exchanges after the Second Vatican Council, tensions in the East–West Schism, and theological discussions on primacy and papal authority involving figures such as Pope John Paul II and Pope Francis. Ecumenical engagement through the World Council of Churches, bilateral dialogues with the Anglican Communion, interactions with Oriental Orthodox Churches like the Coptic Orthodox Church and Syriac Orthodox Church, and relations with Protestant denominations reflect diverse approaches. Political and jurisdictional disputes have arisen involving the Moscow–Constantinople schism (2018) over the Orthodox Church of Ukraine and debates about autocephaly, while cooperation occurs in humanitarian initiatives with organizations like Caritas Internationalis and interfaith encounters with Islamic communities in regions including Greece, Serbia, Lebanon, and Georgia.