Born in Paris, he was the fourth of eleven children of François de Rohan and Anne Julie de Rohan, whose marriage gave rise to the Soubise line of the House of Rohan. His family claimed ancestry from the reigning Dukes of Brittany and at the French court were allowed the rank of Foreign Prince. This entitled them to the style of Highness and other privileges at court. His mother was one-time mistress of Louis XIV. At the time, it was suspected that his younger brotherArmand Gaston Maximilien de Rohan was in fact fathered by Louis XIV. Hercule Mériadec's mother bought the Lordship of Soubise to the family, styling themselves as Prince. Anne Julie herself was Princess of Soubisesuo jure. The second son, Hercule Mériadec, became heir apparent in 1689 at the death of his elder brother Louis, who died aged 22. He was styled Prince of Maubuisson till 1714 when he was made the Duke of Rohan-Rohan. He married twice, firstly to Anne Geneviève de Lévis, daughter of Louis Charles de Lévis and Charlotte de La Motte Houdancourt. Anne Geneviève had been widowed in 1692 having married Louis de La Tour d'Auvergne, son of Godefroy Maurice de La Tour d'Auvergne and Marie Anne Mancini. He died in battle and she and Hercule Mériadec were married in Paris on 15 February 1694. The marriage produced five children, three of whom would have progeny. He lost her only son Jules to smallpox in 1724 as well as his daughter in lawAnne Julie de Melun. His grandson Charles, Prince of Soubise, was born in 1710 and after the death of his parents, was raised by Hercule Mériadec himself to become a man of the court. Charles was later a great friend of Louis XV and the great-grandfather of the murdered Duke of Enghien through his eldest daughter Charlotte. His second daughter Charlotte Armande succeeded her aunt Anne Marguerite de Rohan as Abbess of Jouarre in 1721. Hercule Mériadec was responsible for some interior décor at the Hôtel de Soubise engaging Germain Boffrand in the process. This dates from 1730 to 1740. He outlived his wife by 22 years; Anne Geneviève died in March 1727. The widowed Hercule Mériadec remarried on 2 September 1732 to Marie Sophie de Courcillon who was born in 1713 and had been a mistress of the famous womaniser Louis François Armand de Vignerot du Plessis. Marie Sophie was the daughter of Philippe Egon de Courcillon and Françoise de Pompadour, Duchesse de La Valette. She was also the granddaughter of Philippe de Courcillon, marquis de Dangeau, and Princess Sophia of Löwenstein-Wertheim-Rochefort. He died in Paris on the Rue de Paradis. His grandson, Charles succeeded him to the Rohan-Soubise titles.
