Madame Duclos is the first narrator of 120 Days of Sodom. Her narration is also the only story that is completed by Sade in the novel's draft. Duclos lived her life in a brothel and later became a prostitute herself. Over time, she even took it upon herself to poison the original owner and make the brothel her own. Duclos served as a teacher to the four friends.
The 120 Days of Sodom and Other Writings