In the first Assassin's Creed game, what is the name of the playable assassin?

The playable assassin in the first Assassin's Creed game is Altaïr Ibn-La'Ahad.

Altaïr is a Syrian Assassin operating mainly in the Holy Land during the Third Crusade. The game follows his fall from grace after a failed mission, his demotion within the Brotherhood, and his gradual restoration of rank as he eliminates important targets.

The original game takes place in cities including Masyaf, Jerusalem, Acre, and Damascus. Altaïr's mentor is Al Mualim, the leader of the Assassin Brotherhood at Masyaf. The story also introduces the conflict between the Assassins and the Templars that defines the series.

Altaïr is sometimes confused with Ezio Auditore, the protagonist of Assassin's Creed II and its related games. Altaïr also appears in later series lore, especially through memories and historical records connected to the Apple of Eden.