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 XI Palaiologos
Murad decided in favor of Constantine, and on 6 January 1449 Constantine was crowned in the cathedral at Mistra by the local bishop. It was rare, but not unprecedented, for an emperor to be crowned in a provincial city. Michael VIII Palaiologos, founder of the dynasty of Palaiologos, had been crowned at Nicaea, Asia Minor. John Cantacuzene was crowned at Adrianople, Thrace. Both held a second coronation ceremony at Constantinople, performed by the patriarch.