She is alleged to have privately married the Duc d'Enghien in Baden on 18 February 1804.[3] Before any such marriage was acknowledged publicly, on 21 March 1804 the duke was kidnapped and executed by French troops on the order of Emperor Napoléon, an act which shocked Europe and ultimately extinguished the House of Condé, as he was the only male heir of that cadet branch of the French royal family. Charlotte was never officially recognised as Enghien's widow by the French royal family, neither as émigrés nor during the Bourbon and Orléans restorations, and died in Paris without remarrying at the age of 73.
Louis-Antoine Duke of Enghien
Arms of Bathilde as Duchess of Bourbon, Princess of Condé mother of Louis de Bourbon-Condé, Duc d'Enghien
Arms of the House of Rohan: Gules, nine mascles or
Another Charlotte de Rohan was the paternal grandmother of the Duc d'Enghien, who was distantly related to his alleged wife. In fact, they were 5th cousins once removed, both descending from Hercule de Rohan, Duke of Montbazon.