Duke of Valentinois
Third creation
The first person to hold the title was Honoré II, Prince of Monaco, reigning Prince at the time of its creation; on his death it passed to his son Louis I, and thence to Louis's son Antoine. However, since the title's inheritance was restricted to male heirs, and because Antoine had only daughters and no sons, it was due to pass his brother, François-Honoré Grimaldi, but became extinct on 22 July 1715 when François-Honoré forfeited his right to succeed Antoine.
Duke of Valentinois-6