Marie-Anne de Mailly-Nesle duchess de Châteauroux

Marie Anne de Mailly-Nesle, duchesse de Châteauroux (5 October 1717 – 8 December 1744) was the youngest of the five famous de Nesle sisters, four of whom would become the mistress of King Louis XV of France.

Marie Anne was born the youngest daughter of Louis de Mailly, Marquis de Nesle et de Mailly, Prince d'Orange (1689 - 1767), and his wife, Armande Félice de La Porte Mazarin (1691 - 1729). Her parents had been married in 1709. Her mother was the daughter of Paul Jules de La Porte, duc Mazarin et de La Meilleraye (1666 - 1731), the son of the famous adventuress, Hortense Mancini, the niece of Cardinal Mazarin. Marie Anne had four older full sisters:

The only one of the de Nesle sisters not to become one of Louis XV's mistresses was the Marquise de Flavacourt. Louise Julie was the first sister to attract the king followed by Pauline Félicité, but it was Marie Anne who was the most successful in manipulating him and becoming politically powerful.

Marie Anne also had a younger half-sister, Henriette de Bourbon (1725 - 1780), Mademoiselle de Verneuil, from her mother's relationship with the duc de Bourbon, the chief minister of Louis XV from 1723 to 1726.

In her youth, Marie Anne was known as Mademoiselle de Monchy. On 19 June 1734, she married Jean Baptiste Louis, marquis de La Tournelle (born 1708). Her husband died on 23 November 1740.

In 1726, Marie Anne's oldest sister, Louise Julie, wed her cousin, Louis Alexandre de Mailly, comte de Mailly. Shortly thereafter she caught the attention of King Louis XV, and was permitted by her husband to become a royal mistress. Although she became the king's mistress in 1732, Madame de Mailly was not officially recognized as his maîtresse en titre until 1738. Louise Julie did not use her new position at court to enrich herself or to interfere in politics.

In 1738, she received a letter from her younger sister Pauline-Félicité requesting to be invited to court. Louise Julie granted her sister's wish, but upon her arrival at court, Pauline-Félicité seduced the king and became his mistress.

...
Wikipedia