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Theology and ecclesiology

The Oriental Orthodox Churches are distinguished by their recognition of only the first three ecumenical councils during the period of the state church of the Roman Empire: the First Council of Nicaea in 325, the First Council of Constantinople in 381 and the Council of Ephesus in 431.

Oriental Orthodoxy shares much theology and many ecclesiastical traditions with the Eastern Orthodox Church; these include a similar doctrine of salvation and a tradition of collegiality between bishops, as well as reverence of the Theotokos and use of the Nicene Creed.

The primary theological difference between the two communions is the differing Christology. Oriental Orthodoxy rejects the Chalcedonian Definition, and instead adopts the miaphysite formula, believing that the human and divine natures of Christ are united. Historically, the early prelates of the Oriental Orthodox Churches thought that the Chalcedonian Definition implied a possible repudiation of the Trinity or a concession to Nestorianism.

The break in communion between the imperial Roman and Oriental Orthodox Churches did not occur suddenly, but rather gradually over two to three centuries following the Council of Chalcedon. Eventually the two communions developed separate institutions, and the Oriental Orthodox did not participate in any of the later ecumenical councils.

The Oriental Orthodox Churches maintain ancient apostolic succession and the historic episcopacy. The various churches are governed by holy synods, with a primus inter pares bishop serving as primate. The primates hold titles such as patriarch, catholicos, and pope. The Alexandrian Patriarchate, the Antiochian Patriarchate along with Patriarchate of Rome, was one of the most prominent sees of the early Christian Church.

Oriental Orthodoxy does not have a magisterial leader like the Roman Catholic Church, nor does the communion have a leader who can convene ecumenical synods like the Eastern Orthodox Church. Meanwhile its ecumenical dialogues and internal church relations are led by the Standing Conference of Oriental Orthodox Churches, which acts as the permanent representative council of its member churches.