In the original Assassin's Creed, what is the name of the playable Assassin who serves Al Mualim?

The playable Assassin who serves Al Mualim in the original Assassin's Creed is Altaïr Ibn-La'Ahad.

Altaïr is the central character of the first game, set mainly in the Holy Land during 1191, amid the Third Crusade. At the beginning, he is a highly skilled but arrogant Assassin whose failure during a mission leads to his rank being reduced. Al Mualim, the mentor of Masyaf, then orders him to eliminate a series of targets.

Altaïr's missions take him to Jerusalem, Acre, and Damascus. The game presents him as a historical figure encountered through the memories of Desmond Miles, whose modern-day storyline frames the series' early narrative.

A common mix-up is confusing Altaïr with Ezio Auditore, the protagonist of Assassin's Creed II, or with Malik Al-Sayf, his fellow Assassin and rival. Altaïr's story continues in later material, including Assassin's Creed: Revelations, which explores his final years.