In 1952 he was appointed U.S. Ambassador to El Salvador. In 1965 - 1968 he was U.S. Ambassador to Spain. In 1969 he was U.S. Ambassador to Denmark.
He was married four times. Priscilla St. George (m. 1936; div. 1940). Margaret Screven White (m. 1940; div. 1952). Maria-Luisa de Arana (m. 1952; died 1961). Robin Chandler Lynn ( b 1919. m. 1962; his death 1995).
He had four children from three different wives. Angier "Pony" St. George Duke (1937–2014). Maria-Luisa Duke Cluett (b. 1954). Drexel "Dario" Duke (b. 1957). Angier "Biddle" Duke, Jr. (b. 1963).
He died when he was hit by a car while rollerblading at 79 years near his home at Southampton on Long Island.
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https://www.findagrave.com/memorial/42376054/angier-biddle-duke
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