He was the son of Hercule Meriadec de Rohan, prince de Guéméné and Louise-Gabrielle Julie de Rohan; brother of cardinal de Rohan, and Jules, prince de Guéméné.
He was the child of Hercule Meriadec de Rohan, prince de Guéméné and Louise-Gabrielle Julie de Rohan; brother to a notable family member, the cardinal de Rohan, and Jules, prince de Guéméné.