Imhotep's rise from historical official to worshipped god is unusually well documented for an ancient deification, because both halves of the story survive on their own separate footing. His human career, chancellor and high priest of Heliopolis under Djoser, architect of the Step Pyramid at Saqqara, is fixed by contemporary inscription to the twenty-seventh century BCE. His divine cult belongs to a much later age. The Oxford Encyclopedia of Ancient Egypt places the first secure evidence of his veneration as a healing demigod in the Late Period, centuries after his death, growing by the Ptolemaic period into full godhood: temples raised in his honor, most famously at Deir el-Bahari on the Theban west bank and on the sacred island of Philae, functioned as centers of incubation, where the sick slept within the sanctuary in hope that the god would send a healing dream or a cure directly. He was given a divine genealogy to match his new status, reckoned a son of the craftsman-god Ptah of Memphis, which placed him inside the existing pantheon rather than leaving him a freestanding curiosity. No other private Egyptian official is known to have completed this passage from remembered servant of the crown to independently worshipped deity, which is what makes Imhotep's case the clearest documented instance of the wider Egyptian pattern by which extraordinary reputation, sustained across enough centuries, could itself become grounds for divinity.