Amenemhet III (äˌmĕnĕmˈhĕt, āˌ–) [key], d. 1801 B.C., king of ancient Egypt, of the XII dynasty. He was the son and successor of Sesostris III, with whom he had been coregent. He extended the irrigation system. Thousands of acres in the Faiyûm were reclaimed. Amenemhet IV, his son, succeeded him.
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