Final answer:
The Eastern Orthodox Church originated from the church in Constantinople, and after Rome's fall, the bishop of Constantinople became a significant Christian leader. The Roman Catholic Church did not develop in Constantinople, nor did the Pope live there.
Step-by-step explanation:
Two facts about the relationship between Constantinople and Christianity are:
- B. The Eastern Orthodox Church developed from the church in Constantinople. After the fall of Rome, Christianity was one organization with divided geographical branches. The Eastern branch, led by the Patriarch of Constantinople, solidified its base in Constantinople, using Greek in its services. This separation was further crystallized in the Great Schism of 1054.
- A. After Rome fell, the bishop of Constantinople became one of the most powerful Christian leaders in the Eastern branch of the church. While not necessarily the most powerful leader as the question suggests, the Patriarch of Constantinople held considerable influence in the Byzantine world and was roughly equivalent in stature to the Pope of the Western Church in Rome.
It is important to clarify that the Roman Catholic Church did not develop in Constantinople and the Pope never resided there - these options (C and D) are incorrect.