The library of Altaïr Ibn-La'Ahad was a hidden chamber beneath the fortress of Masyaf. It was rumored to have contained hundreds of books and the wisdom gained from the Apple of Eden by the legendary Assassin Altaïr Ibn-La'Ahad. It was also said to be the hiding place of an extremely powerful weapon and of a means of locating the fabled Grand Temple, which caused the Assassins and Templars to take interest in the library during the Renaissance.