 On 11 December, at the beginning of his trial, Louis XVI was separated from his family.At his birth, Louis-Charles, a "Fils de France" ("Son of France"), was given the title of Duke of Normandy, and, on 4 June 1789, when Louis Joseph, Dauphin of France, his elder brother, died, the four-year-old became Dauphin of France, title he held until September 1791, when France became a constitutional monarchy.Under the new constitution, the heir-apparent to the throne of France, formerly "Dauphin", was restyled "Prince Royal".