Formerly a wizardly apprentice to Pharaoh An-Hepsu XI, Kemusar I ruled as crown regent of Osirion from -1768 AR to -1757 AR following An-Hepsu XI's disappearance. The fall of An-Hepsu XI is said to have included Kemusar's cooperation, and he is one of the few who knew the location of the Incorruptible Pharaoh's prison-tomb. Kemusar I was strangled in his sleep, and his unfinished tomb disappeared from the necropolis at An. It is referred to as the Hungry Sepulcher.