Christianity in Turkey
Constantinople became established in the ecclesiastical hierarchy at the Council of Constantinople in 381. Second only to Rome, the legendary origins of the Patriarchate of Constantinople go back to St. Andrew, Metrophanes and Alexander of Constantinople. Constantinople's primacy over the Patriarchates of Alexandria and Antioch was reaffirmed at the Council of Chalcedon in 481, after which the papacy in Rome supported Constantinople in its dispute with Alexandria over monophysitism. Later, when Rome sought to assert its primacy over Byzantium, the Eastern Orthodox church developed the doctrine of pentarchy as a response.
Constantine II of Constantinople
Constantine II (Greek: Κωνσταντῖνος, "Kōnstantinos"), (? – 7 October 767) was the Ecumenical Patriarch of Constantinople from 754 to 766. He was an iconoclast and a successor of Anastasius of Constantinople, but he was deposed and jailed after the discovery of Constantine Podopagouros' plot against the Emperor Constantine V in June 766, in which the patriarch was later implicated.