Constantinople
Constantinople (; ) was the capital city of the Roman/Byzantine Empire (330–1204 and 1261–1453), and also of the brief Crusader state known as the Latin Empire (1204–1261), until finally falling to the Ottoman Empire (1453–1923). It was reinaugurated in 324 from ancient Byzantium as the new capital of the Roman Empire by Emperor Constantine the Great, after whom it was named, and dedicated on 11 May 330. The city was located in what is now the European side and the core of modern Istanbul.
Egypt (Roman province)
The reign of Constantine also saw the founding of Constantinople as a new capital for the Roman Empire, and in the course of the 4th century the Empire was divided in two, with Egypt finding itself in the Eastern Empire with its capital at Constantinople. Latin, never well established in Egypt, would play a declining role with Greek continuing to be the dominant language of government and scholarship. During the 5th and 6th centuries the Eastern Roman Empire, today known as the Byzantine Empire, gradually transformed itself into a thoroughly Christian state whose culture differed significantly from its pagan past.