Louis Antoine Sophie de Vignerot du Plessis, 4th Duke of Richelieu, was a French nobleman and general. He was known by the courtesy title of Duke of Fronsac before 1788. He also held the titles of Prince de Mortagne, Marquis du Pont-Courlay, Count of Cosnac, Baron de Barbezieux, Baron de Coze and Baron of Saugeon.
- Occupation
- military officer
- Position held
- Premier gentilhomme de la Chambre
- Citizenship
- France
- Born
- February 4, 1736
- Died
