He led a crusade against the Teutonic Knights in Prussia, at the service of the Duke of Bourbon, and was present at the battles of Rosebecque, Verneuil, and Bourbourg. He was later Counsellor and Chamberlain to the Duke of Bourbon and later to the King of France, and tutor to the Dauphin. He also acted as diplomat to Cyprus, Aragon and England.