Constantinople is the city Ezio Auditore explores while seeking Altaïr's memories in Assassin's Creed: Revelations.
Assassin's Creed: Revelations follows an older Ezio as he travels to Constantinople, the capital of the Byzantine Empire, in search of keys connected to Altaïr's legacy. The city is also the setting for a conflict involving Ottoman and Byzantine forces and for Ezio's encounters with local Assassins.
The game links three major protagonists: Ezio in the early 16th century, Altaïr in the medieval period, and Desmond in the modern day. This structure makes Constantinople more than a backdrop; it is the place where Ezio uncovers information that connects the lives and choices of the two earlier Assassin leaders.
The city's modern name, Istanbul, is often used in general discussion, but Constantinople is the historical name used for the game's setting. Florence and Jerusalem belong primarily to earlier chapters of the series.