Charles Bretagne Marie de La Trémoille, 9th Duke of Thouars (24 March 1764 – 10 November 1839), 9th Duke of Thouars, 7th Duke of La Trémoïlle, 10th prince de Tarente, 14th prince of Talmond and 14th Count of Laval,[1] was a French aristocrat and soldier; he was the son of Jean Bretagne Charles de La Trémoille and his wife Princess Marie Maximilienne of Salm-Kyrburg.
The couple had one daughter: At the outbreak of the French Revolution, he sided with King Louis XVI, as did the rest of his family.
In 1789, La Trémoille and his parents emigrated from France, and he joined the émigré army under the Prince of Condé.
She became a writer and left England in company of her brother-in-law Marie François Emmanuel de Crussol for the court of Russia around March 1797, where she was a maid of honour of Empress Maria Feodorovna.
They had two daughters: Following her death, La Trémoille married for a third time in 1830 to Valentine Eugénie Joséphine Walsh de Serrant (7 March 1810 – 10 September 1887).