A later mythology (ultimately a result of the replacement of another deity, Anubis, of the underworld when the cult of Osiris gained more authority), tells us of the birth of Anubis. The tale describes how Nephthys was denied a child by Set and disguised herself as the much more attractive Isis to seduce him. The plot failed, but Osiris now found Nephthys very attractive, as he thought she was Isis. They coupled, resulting in the birth of Anubis. Alternatively, Nephthys had intentionally assumed the form of Isis in order to trick Osiris into fathering her son. In fear of Set's retribution upon them, Nephthys persuaded Isis to adopt Anubis, so that Set would not find out and kill the child. The tale describes both why Anubis is seen as an underworld deity (he becomes a son of Osiris), and why he could not inherit Osiris's position (he was not a legitimate heir in this new birth scenario), neatly preserving Osiris's position as lord of the underworld. It should be remembered, however, that this new myth was only a later creation of the Osirian cult who wanted to depict Set in an evil position, as the enemy of Osiris.
In another Osirian myth, Set had a banquet for Osiris in which he brought in a beautiful box and said that whoever could fit in the box perfectly would get to keep it. Set had measured Osiris in his sleep and made sure that he was the only one who could fit the box. Several tried to see whether they fit. Once it was Osiris's turn to see if he could fit in the box, Set closed the lid on him so that the box was now a coffin for Osiris. Set flung the box in the Nile so that it would drift far away. Isis went looking for the box so that Osiris could have a proper burial. She found the box in a tree in Byblos, a city along the Phoenician coast, and brought it back to Egypt, hiding it in a swamp. But Set went hunting that night and found the box. Enraged, Set chopped Osiris's body into fourteen pieces and scattered them all over Egypt to ensure that Isis could never find Osiris again for a proper burial. Isis and her sister Nephthys went looking for these pieces, but could only find thirteen of the fourteen. Fish had swallowed the last piece, his phallus, so Isis made him a new one with magic, putting his body back together after which they conceived Horus. The number of pieces is described on temple walls variously as fourteen and sixteen, and occasionally forty-two, one for each nome or district.
Assimilation of Hathor
When the cult of Ra rose to prominence he became associated with the similar deity, Horus. For some time, Isis intermittently had been paired as the wife of Ra. Since she was the mother of Horus, he then became the child of Ra as well. A merging of the two male deities resulted in Ra-Horakhty. Hathor had been paired with Ra as well in some regions and when Isis began to be paired with Ra, soon Hathor and Isis began to be merged in some regions also as, Isis-Hathor. Another variant occurred in the Ennead, with Isis as a child of Atum-Ra, making her become the child of Hathor since Hathor had become paired with Ra. This also led to the merger of Hathor and Isis frequently, because of common characteristics.
Mother of Horus
By merging with Hathor, Isis became the mother of Horus, rather than his wife, and thus, when beliefs of Ra absorbed Atum into Atum-Ra, it also had to be taken into account that Isis was one of the Ennead, as the wife of Osiris. It had to be explained how Osiris, however, who (as lord of the dead) being dead, could be considered a father to Horus, who was not considered dead. This conflict in themes led to the evolution of the idea that Osiris needed to be resurrected, and therefore, to the Legend of Osiris and Isis, of which Plutarch's Greek description written in the first century A.D., De Iside et Osiride, contains the most extensive account known today.
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