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Casimir de Rochechouart, 11th Duke of Mortemart (Casimir Louis Victurnien; 20 March 1787, Paris – 1 January 1875, Neauphle-le-Vieux), prince of Tonnay-Charente, then Baron of Mortemart and of the Empire, 11th duke of Mortemart and peer of France (1814), was a French soldier, diplomat and politician. In 1830 Charles X of France made him president of the Conseil des ministres.