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.
Manuel I Komnenos
The empire that Manuel inherited from his father had undergone great changes since the foundation of Constantinople by Constantine I eight centuries before. In the time of his predecessor Justinian I (527–565), parts of the former Western Roman Empire had been recovered including Italy, Africa and part of Spain. However, the empire had diminished greatly following this, the most obvious change had occurred in the 7th century: the soldiers of Islam had taken Egypt, Palestine and much of Syria away from the empire irrevocably. They had then swept on westwards into what in the time of Constantine had been the western provinces of the Roman Empire, in North Africa and Spain. In the centuries since, the emperors had ruled over a realm that largely consisted of Asia Minor in the east, and the Balkans in the west. In the late 11th century the Byzantine Empire entered a period of marked military and political decline, which had been arrested and largely reversed by the leadership of Manuel's grandfather and father. Yet the empire that Manuel inherited was a polity facing formidable challenges. At the end of the 11th century, the Normans of Sicily had removed Italy from the control of the Byzantine Emperor. The Seljuk Turks had done the same with central Anatolia. And in the Levant, a new force had appeared – the Crusader states – which presented the Byzantine Empire with new challenges. Now, more than at any time during the preceding centuries, the task facing the emperor was daunting indeed.