A French writer of romances, a woman of clever wit and of personal charms, who abandoned a religious life and, coming to Paris in 1714, immersed herself in the political and fashionable life of the city; was not too careful of her morals, and ranked among her lovers the Regent, Fontenelle, and Cardinal Dubois; used her influence against the Jansenists; more circumspect in later life she presided over a fashionable salon; was the mother of D'Alembert (1681-1749).