The interior of the fictional Masyaf citadel in Assassins Creed contains an extensive library and the rear is a lush garden above a sheer drop These two properties happen to be known features of the real Alamut which was also a Hashashin fortress at this time Subsequently it is likely that the fictional Masyaf is a combination of features of both fortresses  It may also be the case that the ingame character AlMualim teacher is a portrayal of the real Rashid adDin Sinan who was operating out of Masyaf at the time the game is set Both characters are the leaders of the Masyaf citadel In addition both adDin Sinan and the fictional AlMualim die around the same point in time eg  compared to  So there certainly are elements of the real Masyaf which have carried into the game albeit modified   At any rate a reference to Assassins creed should only be made under the Popular Culture heading