Which Assassin's Creed game is set mainly in Constantinople during the early fifteenth century?

Assassin's Creed Revelations is set mainly in Constantinople during the early fifteenth century.

Released in 2011, the game follows an older Ezio Auditore as he searches for Altaïr Ibn-La'Ahad's legacy. Its principal setting is Constantinople, the capital of the Byzantine Empire, during the early 1500s; the city is divided into districts such as Galata and Constantine.

The story also includes sections set in Masyaf and presents memories from Altaïr's life. This makes Revelations different from Assassin's Creed Brotherhood, whose main setting is Rome, and Assassin's Creed II, which travels through Renaissance Italy. Constantinople was renamed Istanbul in official usage in the twentieth century, but the game deliberately uses its historical-era name.