In Assassin's Creed, Altaïr's home base during the Third Crusade is Masyaf. The mountain settlement serves as the headquarters of the Assassin Brotherhood and is where Altaïr receives missions from Al Mualim.
Masyaf is located in modern-day Syria and is based on a real medieval fortress town associated with the Nizari Ismailis. In the game, its elevated position and fortified architecture emphasize the Brotherhood's isolation and military importance.
Jerusalem, Damascus, and Acre are also major locations in Assassin's Creed, but they are mission cities rather than Altaïr's headquarters. Players repeatedly return to Masyaf between investigations, making it a central hub in the original game's structure.