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Because the capital of the Roman Empire was transferred from Rome to Constantinople in 330 AD.
The catholic church was never moved to constantinople, emperor constatine kept the church in Rome but moved the capitol to Constantinople. The SPRQ's belief of the church for salvation and emotional comfort kept the eastern empire alive for as long as it did, though it ultimately fell.
Both Rome and Constantinople had written laws. Emperor Justinian of Constantinople wrote the Corpus Julius Civilius which was based off the Roman written codes. Also Rome and Constantinople both practiced Christianity. Although Rome followed the Roman Catholicism and Constantinople followed the Eastern Orthodox Church, these are still from the same roots of the belief of Christianity. Also the idea of domes were used by both Rome and Constantinople. Rome had built the "Pantheon" and Constantinople built the Hagia Sophia. Emperor Justinian of Constantinople built the domes even bigger by using the quadrangle underneath the domes. Also both Rome and Constantinople were involved in trade and cultural diffusion with other countries.
Rome is 854 miles away from Constantinople
Constantinople was based on the Christian religion and Rome was against it.
This is the name given to the Eastern Orthodox Church where the Ecumenical Patriarch resides in Constantinople (present-day Istanbul, Turkey). It is the church founded by St Andrew the Apostle, and was the Cathedral Church during the Eastern Roman or Byzantine Empire. It is similar to saying the papal church of Rome where the Pope resides. The Ecumenical Patriarch in Constantinople is known as the 'first among equals' in the Orthodox Church.
Since Rome was then the HQ of the Church of the West, and Constantinople has fallen to the Turks, The Orthodox Church found it suitable to reassign Moscow as The Center of Orthodoxy Christianity, there fore being the "Third Rome."
Hermes Kreilkamp has written: 'Rome and Constantinople in the fifth century' -- subject(s): Relations, History, Constantinople (Ecumenical patriarchate), Catholic Church
Constantinople was approximately 800 miles east from Rome.
The pope in Rome is not the leader of any Orthodox Church. The pope is only the leader of the Roman Catholics and has no jurisdiction (power or authority) over the Orthodox Church, which has its own leaders, such as the Ecumenical Patriarch in Constantinople.
The Ecumenical Patriarch (in Constantinople).
It began when there was a rift within the Orthodox Christian Church over where the Pope should be located.... Constantinople or Rome.