The final novel by the most controversial French writer of the 18th century, the Marquis de Sade. In 1764, the Marquis de Sade discovered documents in the Chartres monastery in Dijon that allowed him to shed light on the life story of one of the most controversial women of the Middle Ages: Queen Isabella of Bavaria, wife of the mad king Charles VI. An eccentric, cruel ruler who loved the pleasures of the flesh and art, yet in her own way a very realistic ruler who advocated for an eternal union between France and England…