Duke of Beaufort was a title in the French nobility.
It was first created in 1597 as a peerage for Gabrielle d'Estrée, Marquesses of Monceaux, the mistress of King Henry IV, with a remainder to their illegitimate son César of Bourbon-Vendôme, later also Duke of Vendôme.
The duchy was sold by the fourth Duke in 1688 to Charles François Frederic of Montmorency-Luxembourg, who was created Duke of Beaufort without a peerage that same year. The duchy was renamed Duchy of Montmorency in 1689. He later succeeded as Duke of Piney-Luxembourg.
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The last duke sold the duchy in 1688.
The Dukedom was renamed Montmorency in 1689. See Duke of Montmorency.
Noble family de Beaufort-Turenne in France (Rosiers-d'Égletons, Limousin), 14th century: