He was the father of Charlotte Louise de Rohan, secret wife of the executed Duc d'Enghien.
His family claimed ancestry from the reigning Dukes of Brittany[1] and at the French court, were allowed the rank of Foreign Prince.
[2] He married Marie Henriette Charlotte d'Orléans-Rothelin, daughter of Alexandre d'Orléans, Marquis of Rothelin and Marie-Catherine de Roncherolles.
The couple were wed at the Église Saint-Sulpice[3] by contract in Paris on 20 May 1762 and officially on 24 May.
His younger sister was Madame de Brionne, the famous salon hostess and wife of Louis de Lorraine, Prince of Brionne.