siege of constantinople

This seems to be one of the potentially most pivotal possible turning points in history. In 716, the Eastern Roman Empire was weakened by the Twenty Year’s Anarchy. The Umayyad Caliph, already overseeing an empire that stretched from Hispania to India, launched an invasion of Asia Minor, and by...

What if the Arabs succesfully took Constaninople during the first siege in 674-678? Would they be able to take the entire Roman Empire as they did the Persian? Or would the Empire be able to succeed and relocate its capital? What would this fall mean for the future of the Orthodox Church? How...