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.
Ecumenical Patriarch of Constantinople
The Council of Chalcedon in 451 established Constantinople as a patriarchate with ecclesiastical jurisdiction over Asia Minor (the dioceses of Asiane and Pontus) and Thrace as well as over the barbaric territories, non-converted lands outside the defined area of the Western Patriarchate (Old Rome) and the other three patriarchates, Alexandria, Antioch and Jerusalem, gave it appellate jurisdiction extraterritorially over canon law decisions by the other patriarchs and granted it honours equal to those belonging to the first Christian see, Rome, in terms of primacy, Rome retaining however its seniority (canon xxviii). Leo I refused to accept this canon, basing himself on the fact that it was made in the absence of his legates. In the 6th century, the official title became that of "Archbishop of Constantinople, New Rome, and Ecumenical Patriarch."