Which Assassin's Creed character is the playable assassin during the Third Crusade?

Altaïr Ibn-La'Ahad is the playable assassin during the Third Crusade in Assassin's Creed.

Altaïr is the central historical character in the 2007 game, where he works in the Levantine branch of the Assassin Order. His missions take him through cities including Jerusalem, Acre, and Damascus while the game presents a fictionalized version of the period surrounding the Third Crusade.

The story begins with Altaïr losing his rank after a failed mission and then rebuilding his reputation under the direction of Al Mualim. His arc explores discipline, obedience, and the meaning of the Assassin creed, especially the maxim that nothing is true and everything is permitted.

Altaïr is sometimes confused with Ezio Auditore, the Italian protagonist of the next major trilogy of games. Altaïr's story is primarily associated with the original game and later appears in parts of Assassin's Creed: Revelations.