He married Marie Élisabeth de Bec-Crespin de Grimaldi, marquise de Vardes, a granddaughter of
Jacqueline de Bueil, mistress of King
Henri IV. Louis and Marie Élisabeth were married on 18 July 1678 at the
Château de Saint-Cloud, residence of
Philippe de France, Monsieur (brother of Louis XIV) and his wife
Elizabeth Charlotte of the Palatinate, Madame. His wife brought a considerable dowry. She was the sole heiress of her father, François René du Bec-Crespin, marquis de Vardes, comte de Moret, and Catherine Nicolaï, marquise de Goussainville. Louis and Jacqueline had 11 children, of which two sons and a daughter would go on to have progeny. Their children were: •
Louis Bretagne Alain de Rohan-Chabot, Duke Rohan, Prince of Léon (1679–1738), who married Françoise de Roquelaure (daughter of
Antoine Gaston de Roquelaure) and had issue. •
Marie Marguerite Françoise de Rohan-Chabot, Mademoiselle de Rohan (1680–1706), who married
Louis Pierre Engelbert de La Marck, Count of Schleiden. • Anne Henriette Charlotte de Rohan-Chabot, Mademoiselle de Léon (1682–1751), who married
Alphonse Dominique François de Berghes, 2nd Prince of Grimberghen, no issue. •
Guy Auguste de Rohan-Chabot, Count of Maillé-Seizploue (1683–1760), who married Yvonne Sylvie du Breil de Rays and had issue; married again to Mary Apolonia Scolastica Stafford-Howard, had no issue. • Charlotte de Rohan-Chabot, Mademoiselle de Porhoëtt (–1710), who never married. • Françoise Gabrielle de Rohan-Chabot (b. 1685), who never married. • Charles Annibal de Rohan-Chabot, Count of Jarnac (1687–1762), who married Henriette Charlotte Chabot,
suo jure Countess of Jarnac, no issue. • Julie Victoire de Rohan-Chabot (1688–1730), who never married. • Constance Eléonore de Rohan-Chabot (1691–1733), who never married. • Marie Armande de Rohan-Chabot (1692–1742), who never married. • Marie Louise de Rohan-Chabot (b. 1697), who never married. Louis died in Paris on 17 August 1727, aged 74. He was buried at the
Château de Blain. Marie Élisabeth survived him until 27 March 1743, when she, too, died in Paris, aged 81. ==Ancestry==