In Assassin's Creed Revelations, what historic name is used for the main city?

Constantinople is the historic name used for the main city in Assassin's Creed Revelations.

Ezio travels to Constantinople in the early sixteenth century while searching for Altaïr's Masyaf keys. The city is divided into districts influenced by Ottoman factions, and Ezio works with Yusuf Tazim, the local leader of the Assassin Brotherhood, to oppose Templar activity.

The city is historically the same urban center now widely known as Istanbul, but Constantinople is the period-appropriate name used for the game's setting. The title's story also returns to Masyaf and includes sequences from Altaïr's life, connecting the two major historical protagonists.

Constantinople should not be confused with Byzantium, an earlier name associated with the settlement, or with Alexandria, the Egyptian city featured prominently in Assassin's Creed Origins. Revelations uses the Ottoman capital as the setting for Ezio's final major adventure.