Hercule Mériadec de Rohan, styled Duke of Rohan-Rohan, was a member of the princely House of Rohan. He married twice and was the grandfather of the Maréchal de Soubise. His first wife was the daughter of Madame de Ventadour. He is known in contemporary texts as the prince de Rohan.

The House of Rohan is a Breton family of viscounts, later dukes and princes in the French nobility, coming from the locality of Rohan in Brittany. Their line descends from the viscounts of Porhoët and is said to trace back to the legendary Conan Meriadoc. Through the Porhoët family, the Rohans are related to the Dukes of Brittany, with whom the family intermingled again after its inception. During the Middle Ages, it was one of the most powerful families in the Duchy of Brittany. The Rohans developed ties with the French and English royal houses as well, and they played an important role in French and European history.