Assassin’s Creed Revelations is set mainly in Istanbul, known in the game’s period as Constantinople.
Ezio travels to the Ottoman capital in the early 16th century to investigate Altaïr Ibn-La’Ahad’s legacy and search for keys connected to the Masyaf library. The city is divided into districts and includes major landmarks such as Hagia Sophia, the Grand Bazaar, and Topkapı Palace.
The game uses both names because the historical setting sits during a period of changing political terminology. Constantinople was the long-established Byzantine name, while Istanbul became the dominant modern English name for the city. In the game’s dialogue and title-era context, “Constantinople” is especially prominent.
This is not the same setting as Jerusalem, Damascus, or Acre, the major cities associated with the original Assassin’s Creed. Nor is it Athens, which is central to Assassin’s Creed Odyssey’s Greek world.