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.
New Rome
New Rome (Greek: Νέα Ῥώμη, "Nea Romē"; Latin: "Nova Roma") was a name sometimes used to describe the new city that the Roman Emperor Constantine created as his new imperial capital on the European coast of the Bosphorus strait. The city was known as Byzantium prior to his rededication, and as Constantinople thereafter, until the 20th century, when it was renamed Istanbul. 'New Rome' was never an official title, but was sometimes used as a laudatory description of the city, which was often compared with Rome in many ways.