Osiris (/oʊˈsaɪrɪs/, from Egyptian wsjr) was the god of fertility, agriculture, the afterlife, the dead, resurrection, life, and vegetation in ancient Egyptian religion. He was classically depicted as a green-skinned deity with a pharaoh's beard, partially mummy-wrapped at the legs, wearing a distinctive atef crown and holding a symbolic crook and flail. He was one of the first to be associated with the mummy wrap. When his brother Seth cut him to pieces after killing him, with her sister Nephthys, Osiris's sister-wife, Isis, searched Egypt to find each part of Osiris. She collected all but one – Osiris's genitalia. She then wrapped his body up, enabling him to return to life. Osiris was widely worshipped until the decline of ancient Egyptian religion during the rise of Christianity in the Roman Empire.
Osiris was at times considered the eldest son of the earth god Geb and the sky goddess Nut, as well as brother and husband of Isis, and brother of Set, Nephthys, and Horus the Elder, with Horus the Younger being considered his posthumously begotten son. Through syncretism with Iah, he was also a god of the Moon.