In Assassin's Creed, which Assassin is the game's playable protagonist in the Holy Land during 1191?

Altaïr Ibn-La'Ahad is the playable protagonist of Assassin's Creed, operating in the Holy Land during 1191.

Altaïr is introduced as a highly ranked Assassin whose actions cause him to lose his status. His mentor, Al Mualim, reduces him to the lowest rank and assigns missions that require him to eliminate influential targets in cities including Masyaf, Acre, Damascus, and Jerusalem.

The game's story presents Altaïr as a fictional Assassin during the Third Crusade, while its modern-day plot follows Desmond Miles. Altaïr is not Ezio Auditore, who leads the Renaissance-era games, and he is not Edward Kenway, the pirate protagonist of Black Flag. Altaïr later appears in other series material, including Assassin's Creed: Revelations, where his life is explored across several historical periods.