Louis_Antoine,_Duke_of_Angoulême

Louis Antoine of France, Duke of Angoulême (6 August 1775 – 3 June 1844) was the elder son of Charles X and the last Dauphin of France from 1824 to 1830. He is identified by the Guinness World Records as the shortest-reigning monarch, reigning for less than 20 minutes during the July Revolution, but this is not backed up by historical evidence. He never reigned over the country, but after his father's death in 1836, he was the legitimist pretender as Louis XIX.
He was a petit-fils de France at birth, and was initially known as Louis Antoine d'Artois. After his father's accession to the throne, he became Dauphin de France, and his surname changed to de France, following the royal custom for princes with such rank.