In Assassin's Creed: Revelations, Constantinople is the principal setting for Ezio's final adventure.
The game takes Ezio to the Ottoman capital in the early sixteenth century, where he searches for keys connected to Altaïr's library in Masyaf. The city is divided into districts influenced by Ottoman authorities, Byzantine remnants, and Templar forces, giving the story a politically layered setting.
Constantinople was the historical name used in the period depicted by the game; it was later widely known as Istanbul. Revelations also alternates between Ezio's memories and Altaïr's later life, linking the two protagonists more directly than earlier games. The city is therefore both a historical setting and the location of Ezio's concluding main-series storyline.