Masyaf serves as the headquarters of the Assassins in the first Assassin's Creed game.
In the 1191 storyline, Masyaf is the mountain settlement where Altaïr Ibn-La'Ahad returns to receive instructions from Al Mualim, the leader of the Assassin Brotherhood. It functions as Altaïr's home base between missions in the major cities of the Holy Land.
The game also features Jerusalem, Acre, and Damascus as principal investigation locations. Their prominence can make them seem like the Brotherhood's headquarters, but each city is a separate target area within the campaign. Masyaf is the fortified mountain stronghold that anchors the opening and later parts of the story.
The setting draws on the historical association of Masyaf with the Nizari Ismaili community in medieval Syria. The game combines that historical background with fictional characters, conspiracies, and supernatural elements from the wider Assassin's Creed universe.