a French general and author, and a member of the French Academy of Sciences. He was the son of Louis de Brancas-Villars and Adelaide-Genevieve d'O, Marquise de Franconville. He married Elisabeth-Pauline de Gand, Princess d'Isenghien, in 1755. He was born at Versailles, Yvelines, Île-de-France, and died in Paris.
