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Mengistu Haile Mariam was born on 21 May 1937 in Addis Ababa, Ethiopia. He was a Marxist revolutionary and military officer who served as the President of Ethiopia from 1974 to 1991. Mengistu was a member of the Derg, a military junta that overthrew Emperor Haile Selassie in 1974. He was appointed Prime Minister of Ethiopia in 1977 and became President in 1987.