Which Assassin's Creed game is set mainly in Constantinople and features Ezio's final campaign?

Assassin's Creed: Revelations is set mainly in Constantinople and features Ezio's final campaign.

Released in 2011, Revelations follows an older Ezio Auditore as he travels to Constantinople, the capital of the Byzantine Empire, in search of Altaïr's hidden knowledge and the keys to Masyaf's library. The city is divided into districts influenced by Ottoman and Byzantine history.

The game connects the two major historical protagonists of the original era: Ezio experiences Altaïr's memories through recovered artifacts and sequences. It also concludes Desmond Miles's main storyline from the first five numbered-era games.

The title is sometimes confused with Brotherhood because both continue Ezio's story directly. Brotherhood is centered on Rome and the Borgia conflict, whereas Revelations moves the historical focus to Constantinople. The game also introduced the hookblade, a distinctive tool used for climbing, traversal, and combat.