Which Assassin's Creed character is the protagonist of the first game?

Altaïr Ibn-La'Ahad is the protagonist of the first Assassin's Creed game. He is a Syrian Assassin operating during the Third Crusade, and players follow his missions across cities including Masyaf, Jerusalem, Acre, and Damascus.

At the beginning of the story, Altaïr's arrogance causes him to lose his rank and equipment. His mentor, Al Mualim, orders him to complete a series of investigations and assassinations before restoring his status. These missions gradually reveal a larger conflict involving the Templars and the Apple of Eden.

Altaïr's story continues in later series material, including Assassin's Creed: Bloodlines and the novel Assassin's Creed: The Secret Crusade. He also appears in the broader historical narrative surrounding Desmond Miles.

Ezio Auditore is the lead character of the next main game, Assassin's Creed II, while Desmond is the modern-day character who experiences Altaïr's memories through the Animus.