Louis XVIII , known as the Desired , was a monarch of the House of Bourbon who ruled as King of France from 1814 to 1824 except for a period in 1815 known as the Hundred Days. Louis XVIII spent twentythree years in exile, from 1791 to 1814, during the French Revolution and the First French Empire, and again in 1815, during the period of the Hundred Days, upon the return of Napoleon I from Elba.
Louis Stanislas Xavier, styled Count of Provence from birth, was born onNovember 1755 in the Palace of Versailles, the son of Louis, Dauphin of France, and his wife Maria Josepha of Saxony. He was the grandson of the reigning King Louis XV. As a son of the Dauphin he was a Fils de France. Louis Stanislas was christened Louis Stanislas Xavier six months after his birth in accordance with Bourbon family tradition, being nameless before his baptism. By this act, he became also a Knight of the Order of the Holy Spirit. The name of Louis was bestowed because it was typical of a prince of France Stanislas was chosen to honour his greatgrandfather King Stanisaw I of Poland and Xavier was chosen for Saint Francis Xavier, whom his mothers family held as one of their patron saints.
Source: Wikipedia