Duc de Beaufort was a title in the French nobility. It was first created in 1597 as a peerage for Gabrielle d'Estrées, Marquise de Monceaux, the mistress of King Henri IV, with a remainder to their illegitimate son César de Bourbon, later also Duc de Vendôme. The duchy was sold by the fourth Duke in 1688 to Charles François Frederic de Montmorency-Luxembourg, who was created Duc de Beaufort (without a peerage) that same year. The duchy was renamed Duc de Montmorency in 1689; see that title. He later succeeded as Duc de Piney-Luxembourg.
Beaufort gave way on this question, but an unsuccessful attempt was made in 1429 to deprive him of his see.
Beaufort, however, gradually retired from public life, and after witnessing the conclusion of the treaty of Troyes died at Wolvesey palace, Winchester, on the 10th of April 1447.
Beaufort was a man of considerable wealth, and on several occasions he lent large sums of money to the king.
To the house of Montglat in 1694, the comte de Chiverny in 1718 (EdlF).
The title of prince de Guéméné was commonly used by the eldest son of the ducde Montbazon.
At the death of François-Joseph de Lorraine, ducde Guise in 1675, his paternal great-aunt Marie de Lorraine (1615-88), sister of Henri II de Guise, inherited Joinville, which she left to Charles de Stainville, comte de Couvonges, with a remainder to the younger sons of the duke of Lorraine's younger sons and their heir males.
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