Masyaf is the Assassin Brotherhood’s mountain headquarters in the original Assassin’s Creed.
In the game, Masyaf is a fortified settlement in the Levant and the home of the Assassin Brotherhood. Altaïr returns there between missions to receive instructions, report progress, and interact with his mentor, Al Mualim.
The location is based on the real Syrian town of Masyaf, which is associated with the historical Nizari Ismaili community and its medieval fortress. The game fictionalizes the site and connects it to the wider Assassin mythology.
Masyaf is not the same place as Monteriggioni, the Italian villa associated with Ezio in Assassin’s Creed II. Ravensthorpe is a settlement in Assassin’s Creed Valhalla, while Aletheia is a fictional Isu-related entity rather than a headquarters. Masyaf also returns in Assassin’s Creed Revelations, where it has an important connection to Altaïr’s later story.