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.
Christian culture
The dedication of Constantinople as capital in 330 AD created a great new Christian artistic centre for the Eastern Roman Empire, which soon became a separate political unit. Major Constantinopolitan churches built under Constantine and his son, Constantius II, included the original foundations of Hagia Sophia and the Church of the Holy Apostles. As the Western Roman Empire disintegrated and was taken over by "barbarian" peoples, the art of the Byzantine Empire reached levels of sophistication, power and artistry not previously seen in Christian art, and set the standards for those parts of the West still in touch with Constantinople.