Louis XVI (Louis-Auguste; French: [lwi sɛːz]; 23 August 1754-21 January 1793) was the last king of France before the fall of the monarchy during the French Revolution.Louis XVI was the husband of Marie Antoinette.. The son of Louis, Dauphin of France (son and heir-apparent of King Louis XV), and Maria Josepha of Saxony, Louis became the new Dauphin when his father …