http://en.wikipedia.org/wiki/Henri-Nompar_de_Caumont,_duc_de_La_Force

Henri-Nompar de Caumont, duc de La Force (1582 – January 1678) was Duc de La Force and peer of France. He was the son of Marshal of France, Jacques-Nompar de Caumont, duc de la Force and Charlotte de Gontaut, daughter of Marshal Armand de Gontaut, baron de Biron. First Marquis de Castelnau, later Duc de La Force after the death of his brother, he served King Louis XIII on many occasions. He served in the army under his father and was Maréchal-de-camp.