Louis Antoine of France, Duke of Angoulême 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.

Dauphin of France, originally Dauphin of Viennois, was the title given to the heir apparent to the throne of France from 1350 to 1791, and from 1824 to 1830. The word dauphin is French for dolphin and was the hereditary title of the ruler of the Dauphiné of Viennois. While early heirs were granted these lands to rule, eventually only the title was granted.