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Sir Denis Thatcher, 1st Baronet, MBE, TD, CStJ (10 March 1915 – 26 June 2003) was a British businessman and Conservative politician. He was married to Margaret Thatcher, who was Prime Minister of the United Kingdom from 1979 to 1990. Thatcher was the first man to be made a baronet for his own achievements rather than those of his father or grandfather.