Osirisis the god of the dead, the afterlife and the underworld and is at times considered the oldest son of the Earth god Geb, and the sky goddess Nut, as well as being brother and husband of Isis, with Horus being considered his posthumously begotten son. He is also associated with the epithet Khenti-Amentiu, which means "Foremost of the Westerners" — a reference to his kingship in the land of the dead. As ruler of the dead, Osiris is also sometimes called "king of the living", since the Ancient Egyptians considered the blessed dead "the living ones". Osiris is first attested in the middle of the Fifth dynasty of Egypt, although it is likely that he is worshipped much earlier; the term Khenti-Amentiu dates to at least the first dynasty, also as a pharaonic title. Most information we have on the myths of Osiris is derived from allusions contained in the Pyramid Texts at the end of the Fifth Dynasty, later New Kingdom source documents such as the Shabaka Stone and the Contending of Horus and Seth, and, much later, in narrative style from the writings of Greek authors including Plutarch and Diodorus Siculus.
Osiris is not only a merciful judge of the dead in the afterlife, but also the underworld agency that granted all life, including sprouting vegetation and the fertile flooding of the Nile River. He is described as the "Lord of love", "He Who is Permanently Benign and Youthful" and the "Lord of Silence". The Kings of Egypt were associated with Osiris in death — as Osiris rose from the dead they would, in union with him, inherit eternal life through a process of imitative magic. By the New Kingdom all people, not just pharaohs, were believed to be associated with Osiris at death if they incurred the costs of the assimilation rituals.