For over two centuries, the Dukes of Aumont held the position of First Gentleman of the Bedchamber to the king (Premier gentilhomme de la chambre du Roi).
Towards the end of that century, the family changed sides to the Dukes of Burgundy, but transferred its loyalties back to the Kings of France after the death of Charles the Bold in 1477.
[5] Jean V d'Aumont, a Lieutenant-General in the French Army and Governor of Burgundy, was a key player under Louis XII and Francis I. Jean VI d'Aumont (1552–1595) a Marshal of France and appointed an inaugural Knight of the Holy Spirit in 1578, fought against the Huguenots under the last of the Valois kings; he was among the first to recognize Henry IV, and was appointed Governor of Champagne and of Brittany, where he faced battles against the Catholic League.
He was Marquis of Villequier, Isle, Nolay and Chappes, as well as Baron of Estrabonnes, before being created Duke of Aumont and a Peer of France in 1665.
Roger D'Aumont (1645–1651) was anointed Bishop of Avranche in the Catholic Diocese of Coutances, which includes the renowned abbey of Mont-Saint-Michel.