Marie Sophie de Courcillon

Marie Sophie de Courcillon was a French noblewoman and Duchess of RohanRohan as well as Princess of Soubise by marriage. She was the grand daughter of Philippe de Courcillon, better known as the marquis de Dangeau. She was praised for being a cultured woman for the age and held a fashionable salon at the Htel de Soubise in Paris. She was painted by Nattier.

Her husband died in 1746 in Paris. She was the mistress of Duke de Richelieu, who lost his last wife, born lisabeth Sophie de Lorraine in 1740. She died in Paris at the age of 42.

Source: Wikipedia