In Assassin's Creed Revelations, which historical city is explored by Ezio Auditore?

Constantinople is the historical city explored by Ezio Auditore in Assassin's Creed Revelations.

The game takes Ezio to the Ottoman capital in the early sixteenth century, where he searches for Altaïr's lost library keys and becomes involved in a conflict between local Assassins and Templars. Constantinople's districts are divided by the Golden Horn, and the city serves as the main environment for Ezio's final starring adventure.

The story also includes sequences set in Masyaf and memories of Altaïr's life. Constantinople is the historical name used in the game for the city now commonly called Istanbul. It was the capital of the Byzantine Empire before the Ottoman conquest and remained the Ottoman capital during Ezio's visit, making it a fitting meeting point for the series' older and newer protagonists.