On 10 February 1743 he married
Marie Louise de La Tour d'Auvergne (1725–1793), daughter of
Charles Godefroy de La Tour d'Auvergne,
Duke of Bouillon and
Maria Karolina Sobieska. Together, Jules and Marie Louise had one son: •
Henri Louis de Rohan, Duke of Montbazon, Prince of Guéméné (1745–1809), who married a second cousin,
Victoire de Rohan, daughter of
Charles de Rohan, Prince of Soubise and
Anne Therese of Savoy; she was the sister of the
Princess of Condé and posthumous step-daughter of
Madame de Soubise. The Prince of Guéméné died in
Belgium in 1788. His son, daughter-in-law, and grandchildren fled to
Bohemia before the
French Revolution. ==Ancestry==