He was also known as the Prince of Bidache (the principality of Bidache maintained de jure sovereignty from 1570 until 1790 when, by royal edict, the territory of the principality was declared to be a part of France by Louis XVI, although his ancestor, Antoine de Gramont, wasn't ousted until 1793).

[9] Following his father's death, he inherited the Château de Vallière, which had been built by his grandfather in the Grand Parc in Mortefontaine in 1894.

[11] The Charlepont stud farm, the Circuit de Mortefontaine [fr] site and the woods outside the park remained owned by the Gramont family.

[12] On 18 July 1949 at the Cathedral of Saint-Louis des Invalides in Paris, he married Odile Marguerite Marie Marthe Madelene Sublet d'Heudicourt de Lenoncourt (1914–1994), a daughter of Gérard Sublet d'Heudicourt de Lenoncourt and Thérèse Gautier Vignal (a daughter of Count Albert Gautier Vignal).

[13] Together, they were the parents of:[14] The Duke died at Les Lilas, a commune in the northern-eastern suburbs of Paris, on 12 December 1995.