Assassin’s Creed Revelations uses Istanbul as the modern name for Constantinople.
The game’s historical storyline is set mainly in Constantinople during the early sixteenth century. In that period, the city was the capital of the Ottoman Empire and remained one of the most important political and commercial centers in the Mediterranean. The game places Ezio Auditore there while he searches for Altaïr’s ancient artifacts and memories.
The city was known as Constantinople for centuries, but Istanbul is the name used today. The Ottoman conquest in 1453 transformed the city into the empire’s capital, and Assassin’s Creed Revelations reflects its Ottoman setting through architecture, factions, markets, and characters.
Players may also encounter the city name in historical references that use Constantinople, Byzantium, or Istanbul depending on the period being discussed. For the game’s title and modern geographic identification, Istanbul is the canonical answer.