Louis, Dauphin of France (Louis Ferdinand; 4 September 1729 – 20 December 1765) was the elder and only surviving son of King Louis XV and his wife, Queen Marie Leszczyńska. As a son of the king, Louis was a fils de France. As heir apparent, he became Dauphin of France. Although he died before ascending to the throne himself, all three of his sons who made it to adulthood would go on to be King: Louis XVI (r. 1774–1792), Louis XVIII (r. 1814–1815, 1815–1824) and Charles X (r.1824–1830).