Isis, the Egyptian throne-goddess Aset, became through the sanctuary of Philae the supreme goddess of the whole Nubian frontier and of the Blemmyes of the Eastern Desert. Though Egyptian in origin, she was so thoroughly embraced by the ancestors of the Beja that a formal treaty with Rome guaranteed them the right to borrow her cult image and bear it in procession into their own country; her pilgrims from the desert continued their devotions long after the rest of the empire had turned to Christianity, making the Blemmyes her final worshippers until Justinian ordered Philae closed. Sources present her as mistress of magic and healing, guarantor of the Nile flood, wife and reviver of Osiris at the neighbouring Abaton, and the divine centre around whom the Nubian gods Mandulis, Arensnuphis and Ptiris were gathered.