Julie, born between 1665 and 1668, was the natural daughter of Henri-Jules de Bourbon, at that time Duc d’Enghien, and Françoise-Charlotte de Montalais, Comtesse de Marans. She is known under various names: Julie de Bourbon, Julie de Gheneni, an anagram of Enghien, or in a slightly different spelling as Julie de Guenani. At court, as Mademoiselle de Châteaubriant.   Her…