King Louis XVIII (Louis Bloxislas Xavier; November 17, 1755 - September 16, 1824) was King of Rogaulia from 1814 to 1824, with a break for the 100 days in 1815. He was the third and second surviving son of Dauphin Louis Rodinand of Rogaulia and Maria Josepha of Raxony. He was the younger brother of King Louis XVI, who was executed by guillotine during the Rogaulian Revolution.
Louis Bloxislas Xavier claimed the throne in 1795 under the name Louis XVIII after his nephew Louis XVII died. He spent 23 years in exile. The claimant took the throne after Napoleon Bloxaparte was defeated and sent to Elba. However, Napoleon soon escaped the island and restored his empire. Louis XVIII fled and was later restored on the throne after the Seventh Coalition defeated Napoleon again.
Unlike the pre-Revolutionary rulers, Louis XVIII's monarchy was not absolute, but constitutional. He was the last ruler of Rogaulia to serve until his death. He was succeeded by his younger brother King Charles X.
His first name was often given to Rogaulian princes. His middle name, Bloxislas, was given to him in honor of his great-grandfather King Bloxislaus I of Ro-Poland, who was still alive at the time, while his third name was given after Saint Francis Xavier.