Duke of Valentinois

Duke of Valentinois (French: Duc de Valentinois; ), formerly Count of Valentinois, is a title of nobility, originally in the French peerage. It is currently one of the many subsidiary titles claimed by the ruling Princes of Monaco despite its extinction in French law in 1949. Though the duchy was originally associated with administrative authority as well as possession of manors in Valence, as noble prerogatives in France's ancien régime were whittled away the dukedom had become purely a hereditary title by the 20th century.