Joachim-Napoleon Murat was the brother-in-law of Napoleon Boneparte, and held many titles in his life including Marshal of France, Grand Admiral of France, Grand Duke of Berg, and King of Naples. The story was first published as part of Dumas's eight-volume series "Celebrated Crimes" (1839--40), and recounts Murat's fall from favour and fascinating death - subsequent to Napoleon's own demise.