In Assassin's Creed, what is the name of the Assassin protagonist living in Masyaf in 1191?

In Assassin's Creed, the Assassin protagonist living in Masyaf in 1191 is Altaïr Ibn-La'Ahad.

Altaïr is the central historical character in the first Assassin's Creed game. He is introduced as a highly skilled Assassin whose arrogance leads to a serious failure during a mission at Solomon's Temple. As punishment, his rank and equipment are taken away, and he must rebuild his reputation by carrying out missions for Al Mualim, the leader of the Assassin stronghold at Masyaf.

The game places Altaïr in the Levant during the Third Crusade. His investigations take him to cities including Jerusalem, Acre, and Damascus, where he targets influential figures connected to the Templar Order. Players sometimes confuse Altaïr with Desmond Miles, the modern-day character who experiences Altaïr's memories through the Animus. Altaïr is the historical ancestor, while Desmond is the person accessing those memories.

Altaïr also appears in later series material, including Assassin's Creed: Revelations, which explores his later life and legacy. His name is commonly rendered with different transliterations, but “Altaïr Ibn-La'Ahad” is the standard English form used for the character.