Sesostris I sĭsŏs´trĭs [key], d. 1926 BC, king of ancient Egypt, 2d ruler of the XII dynasty; son and successor of Amenemhet I . He was coregent with his father from 1980 BC; from 1971 to 1926 he was sole ruler. His reign was notable for successful campaigns in Nubia. Sesostris' son and successor, Amenemhet II , was his coregent during the last three years of his reign.
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