He was long in great favour at court, and his wife, Anne d'Arpajon, Comtesse de Noailles, was first lady of honour to Marie Antoinette, and was nicknamed by her Madame Etiquette.

This court favor brought down punishment in the days of the French Revolution, and the old marshal, his sister, his wife, daughter-in-law and granddaughter were all guillotined on 27 June 1794.

[1] Twenty-five days later, the widow, daughter-in-law, and granddaughter of the 4th Duc de Noailles were also guillotined.

In 1767, he received the additional French title of Duc de Poix à brevêt.

The title of Prince de Poix passed to his son, Charles-Adrien, as a courtesy title on the latter's birth in 1747, and after the child's death later that year and the infant deaths of two more sons, came to rest on Noailles's successor, Philippe-Louis-Marc-Antoine.