Alexandre Dumas père, the father of the famous author Alexandre Dumas, is credited with inventing the nickname La Reine Margot for the 16th century queen of France, Marguerite de Valois. Dumas used the nickname in his 1845 historical novel of the same name, which tells the story of Marguerite's life and reign.
The Enchanting Reign of Margaret of Valois: How Well Do You Know the Queen Consort of France?