Louis XVII ( 27 March 1785 - 8 June 1795 ) of France and Navarre , son of King Louis XVI and Marie Antoinette , was the King of France and Navarre from 1793 to 1795 although he never ruled . He is also known as Louis-Charles , Duke of Normandy and Fils de France or son of France Louis XVII ( Versailles 27 March 1785 â `` Paris 8 June 1795 ) , from birth to 1789 known as Louis-Charles , Duke of Normandy ; then from 1789 to 1791 as Louis-Charles , Dauphin of France ; and from 1791 to 1793 as Louis-Charles , Prince Royal of France , was the son of King Louis XVI of France and Queen Marie Antoinette .