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.
First Council of Constantinople
The First Council of Constantinople (381) was the first appearance of the term 'New Rome' in connection to Constantinople. The term was employed as the grounds for giving the relatively young church of Constantinople precedence over Alexandria and Antioch ('because it is the New Rome').