Prince Benedetto, Duke of Chablais
His uncle Francis I, Holy Roman Emperor wanted him to marry his daughter daughter Maria Christina of Austria as but it never happened. In 1753 his father gave what is now the Palazzo Chiablese as a home. Chablais extended the palace. His father gave him the title of Duke of Chablais in 1763.  As the son of a reigning King he was entitled to the style of Royal Highness.