Hortense Félicité de Mailly-Nesle, Mademoiselle de Chalon, marquise de Flavacourt (11 February 1715 – 28 December 1799) was a French courtier, one of the five famous de Nesle sisters, four of whom would become the mistress of King Louis XV. Unlike each of her four sisters, she never became the king's mistress, though she was often the subject of speculations.
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Life
Hortense Félicité was born the daughter of Louis de Mailly, marquis de Nesle et de Mailly, Prince d'Orange (1689 - 1767) and Armande Félice de La Porte Mazarin (1691-1729). She had four full sisters, Louise Julie de Mailly, Pauline Félicité de Mailly, Diane Adélaïde de Mailly, and Marie Anne de Mailly.
Hortense Félicité de Mailly-Nesle married François-Marie de Fouilleuse, marquis de Flavacourt, in 1739. They had two children Auguste de Fouilleuse, comte de Flavacourt and Adélaïde de Fouilleuse. The marriage was unhappy.
Lady-in-waiting
She was appointed dame du palais to the popular Queen Marie Leszczynska in 1742, the same year her sister Marie Anne de Mailly became the official mistress of the king.