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.
Christian culture
The dedication of Constantinople as capital in 330 AD created a great new Christian artistic centre for the Eastern Roman Empire, which soon became a separate political unit. Major Constantinopolitan churches built under Constantine and his son, Constantius II, included the original foundations of Hagia Sophia and the Church of the Holy Apostles. As the Western Roman Empire disintegrated and was taken over by "barbarian" peoples, the art of the Byzantine Empire reached levels of sophistication, power and artistry not previously seen in Christian art, and set the standards for those parts of the West still in touch with Constantinople.