Adélaïde Diane de Cossé, called "Mancinette", née Mazarini-Mancini (1742–1808), was a French court official. She served as the dame d'atour to queen Marie Antoinette from 1771 to 1775. She is known to have curbed the expenses of the queen's wardrobe during her time in office and created order in the queen's economy, which was however ruined by her successor. Life She was the daughter of Louis-Jules Mancini-Mazarini, duc de Nevers (1716–1798), and Hélène-Françoise-Angélique Phélypeaux de Pontchartrain (1715–1781), and married in 1760 to Louis Hercule Timoléon de Cossé-Brissac, duc de Brissac (1734–1792). They had one son, Jules Gabriel Timoléon, who died as a toddler, and one daughter, Adélaïde-Pauline-Rosalie, who lived to adulthood, married Victurnien-Jean-Baptiste de Rochechouart de Mortemart, duc de Mortemart, and had several children of her own. Appointment In September 1771, she was appointed dame d'atour to the dauphine after the death of her predecessor, Amable-Gabrielle de Villars. Her appointment took place in the midst of a conflict between Marie Antoinette and Madame du Barry. She had been given the office on the request of du Barry, but this was because her husband was an ally of du Barry's and she was expected to share his loyalties and act as an agent of the royal mistress. However, de Cossé had opposing opinions to those of her husband and actively allied with the crown princess against the royal mistress. Despite having du Barry to thank for her office, she refused her invitations and demonstrated her loyalty to the crown princess, which resulted in a chain of court scandals. Dame d'atour Adélaïde Diane de Cossé was described as an honest and serious-minded person. When she took on her duties, she was reportedly shocked over the disorder and extravagance in the household of Marie Antoinette. In 1771, Marie Antoinette was not yet interested in fashion, and the financial disorder of her household was the result of the neglect by Adélaïde Diane de Cossé's predecessor in the office. Amable-Gabrielle de Villars had been given the office of dame d'atour to Marie Antoinette upon her arrival in France because the entire household of the former queen had been transferred to the new crown princess upon her arrival, and de Villars had merely kept her position. In reality, however, Amable-Gabrielle de Villars had by 1770 became too old and infirm to manage her office, and during her tenure, the Household of the Dauphine had abused her