Louis-Léon de Brancas (3 July 1733 – 9 October 1824), 3rd duc de Lauraguais, 6th duc de Villars, was a French general and author, and a member of the French Academy of Sciences.

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He was the son of Louis de Brancas-Villars and Adelaide-Genevieve d'O, Marquise de Franconville.^[1] He married Elisabeth-Pauline de Gand, Princess d'Isenghien, in 1755.

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