Possible Clues:

• Marquis of note
• Marquis __
• Marquis name
• Infamous Marquis
• 'The Crimes of Love' author Marquis ___
• Infamous marquis
• See Dad created a marquis
• He called wedlock 'The most loathsome of all the bonds humankind has devised'
• 'Justine' novelist
• French author many considered depraved