What is the historical name of the city mainly explored in Assassin's Creed Revelations?

The historical city mainly explored in Assassin's Creed Revelations is Constantinople.

The game is set primarily in Constantinople during the early sixteenth century, when the city was the capital of the Ottoman Empire. The modern city is now called Istanbul, but Constantinople is the historical name used for the setting and period represented in the game.

Ezio Auditore travels there to search for Altaïr Ibn-La'Ahad's keys and uncover the secrets of the Masyaf fortress. The city includes districts on both sides of the Golden Horn, and its architecture, markets, waterways, and political factions shape the campaign.

Suleiman the Magnificent appears as a young prince, while Yusuf Tazim leads the local Assassin guild. Revelations was released in 2011 and closes Ezio's principal story arc. Alexandria is associated especially with Assassin's Creed Origins, and Rome is the main setting of Brotherhood.