 He is last seen warning Roxane of a plot to kill Cyrano - a plot which unfortunately succeeds.His younger half-brother was Philibert, comte de Gramont (1621–1707), renowned for his memoirs describing the love affairs of the English court of Charles II, edited by Antoine Hamilton.In 1634, he married Richelieu's niece, Françoise-Marguerite du Plessis de Chivré (1608–1689).