In Assassin's Creed, which assassin does the player control in the game's 1191 storyline?

In Assassin's Creed, the assassin controlled in the game's 1191 storyline is Altaïr Ibn-La'Ahad.

Altaïr is the central playable character in the first main Assassin's Creed game. The story follows him during the Third Crusade, with major locations including Jerusalem, Acre, and Damascus. After making a serious mistake during an early mission, Altaïr is demoted and must regain his rank by carrying out assignments for the Assassin Brotherhood.

The game presents Altaïr as a skilled but initially overconfident assassin. His missions gradually expose a political conspiracy involving the Templars and the mysterious Apple of Eden. Players sometimes confuse Altaïr with Ezio Auditore, who became the protagonist of the next major game, Assassin's Creed II. Altaïr also appears in later franchise stories, but he is most directly associated with the original 2007 title.