What is the name of Desmond Miles's Assassin ancestor in the first Assassin's Creed?

Altaïr Ibn-La'Ahad is Desmond Miles's Assassin ancestor in the first Assassin's Creed.

The game uses the Animus to let Desmond experience Altaïr’s genetic memories. Altaïr is an Assassin active during the Third Crusade, and his missions take him through several cities in the Levant while he investigates targets connected to the Templars.

At the beginning of the story, Altaïr loses his rank after a failed mission and must regain the trust of his mentor, Al Mualim. His journey gradually challenges his assumptions about the Assassin Order and the relationship between obedience, knowledge, and freedom.

The character’s name is commonly written with a dotless or accented form, but “Altaïr Ibn-La'Ahad” is the standard English rendering used in reference material. Ezio, Bayek, and Arno are protagonists from different historical periods.