In what year was Louis Joseph de Frances's mother born?
Louis Joseph, Dauphin of France Louis Joseph de France (Louis Joseph Xavier François; 22 October 1781 – 4 June 1789) was the second child and elder son of King Louis XVI of France and Marie Antoinette. As son of a king of France, he was a "fils de France" ("Son of France"), and as the eldest son and heir apparent, he was Dauphin of France, (the twenty-sixth "crown prince" of the Capetian and Bourbon monarchies).
Marie of Prussia Marie of Prussia (German: "Marie Friederike Franziska Hedwig von Preußen" ; October 15, 1825 – May 17, 1889) was Queen of Bavaria and the mother of Kings Ludwig II and Otto of Bavaria.