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Horustep III was a pharaoh, or king, of Mulhorand. He ascended to the throne in the summer of 1357 DR at the age of 11 after the assassination of his father, Akonhorus II. He approved the Mulhorandi invasion of Unther following the Time of Troubles and the Untheric god-king Gilgeam's death at the hand of Tiamat.