Who is Marquis de Sade from Mad Love and what is their importance?

This is a French aristocrat and author from the late eighteenth and early nineteenth century. Marquis de Sade is known for his erotic and blasphemous novels, many of which were written while he was imprisoned. The surrealists often described de Sade as a progenitor. de Sade's influence is seen in multiple places in Mad Love. Breton mentions Marquis de Sade's New Justine in Section 5, and L'Age d'or was based partly on one of his stories called the 120 Days of Sodom.