Estrées, Gabrielle d' (gäbrēĕlˈ dĕstrāˈ) [key], 1573–99, famous beauty, mistress (1592–99) of Henry IV of France, who made her marquise of Monceaux and duchess of Beaufort. She divorced her husband, and Henry was preparing to divorce Margaret of Valois, with the object of marrying Gabrielle, when Gabrielle died. Her three children by Henry were legitimized. One of them was César, duc de Vendôme.
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