Madeleine d'Arsant de Puisieux, born in Paris, was Diderot’s lover and sometimes co-author. She was married to Philippe-Florent de Puisieux, a lawyer and diplomat who was one of Diderot's collaborators on the Encyclopédie. She was the author of Conseils à une amie (1749); Les Caractères (1750); Le Plaisir et la volupté (1752); L'Education du Marquis de ∗∗∗ (1753); Alzarac ou la nécessité d'être inconstant (1762); Le marquis à la mode (1763); and Histoire de Mlle de Terville (1768). Her works show that she held reformist and anti-clerical views on education, religious tolerance, individual rights, and the position of women in society. In 1750, she published the feminist text La Femme n’est pas inférieure à l'homme (Woman Is Not Inferior to Man), republished the following year as Le Triomphe des dames (The Triumph of Women). However, some authorities consider that this was just a translation of an original English text by Lady Mary Wortley Montagu.