Diane de Poitiers (9 January 1500 – 25 April 1566) was a French noblewoman and courtier who wielded much power and influence as King Henry II's royal mistress and adviser until his death. Her position increased her wealth and family's status. She was a major patron of French Renaissance architecture.
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Diane of Poitiers in the context of Duke of Valentinois
Duke of Valentinois (French: Duc de Valentinois; Italian: Duca Valentino) is a title of nobility, originally in the French peerage. It is currently one of the many hereditary titles claimed by the Prince of Monaco despite its extinction in French law in 1949. Though it originally indicated administrative control of the Duchy of Valentinois, based around the city of Valence, the duchy has since become part of France, making the title simply one of courtesy.
It has been created at least four times: on August 17, 1498, for Cesare Borgia, in 1548 for Diane of Poitiers, in 1642 for Prince Honoré II of Monaco, and most recently in 1715 for Prince Jacques I of Monaco.