In Assassin's Creed, Altaïr Ibn-La'Ahad's mentor and the Order's leader in 1191 is Al Mualim.
Al Mualim, whose name means “the Teacher” in Arabic, leads the Assassin bureau at Masyaf during the Third Crusade. He sends Altaïr on missions against targets connected with the Templar Order, including figures in cities such as Damascus, Acre, and Jerusalem.
The relationship is central to the game's story. Altaïr begins as an exceptionally skilled but arrogant Assassin, and Al Mualim disciplines him after a failed mission. Altaïr must then complete a sequence of investigations and assassinations while learning that the targets are linked by a larger political conspiracy.
Players sometimes confuse Al Mualim with Rashid ad-Din Sinan, the historical leader associated with the Nizari Ismaili community at Masyaf. The game draws on that historical setting but presents Al Mualim as a fictionalized character within its own modern-day science-fiction narrative.