Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

His festivals were celebrated at the Temple of Abydos, which marked the place where he assimilated Khenty-Imentin and picked up the epithet foremost of the westerners. Namesake gardens were assimilated at his festivals, which usually reenacted his fate, in which his brother sliced him into fourteen pieces. For 10 point, name this husband of Isis and father of Horus, the Egyptian god of the underworld.
Social Science