During the wars over the succession of Galicia-Volhynia Principality in 1339 King Casimir III of Poland undertook an expedition and conquered Lviv in 1340, burning down the old princely castle. Poland ultimately gained control over Lviv and the adjacent region in 1349. From then on the population was subjected to attempts to both Polonize and Catholicize the population. The Lithuanians ravaged Lviv land in 1351 during the Halych-Volhyn Wars with Lviv being plundered and destroyed by prince Liubartas in 1353. Casimir built a new city center (or founded a new town) in a basin, surrounded it by walls, and replaced the wooden palace by masonry castle – one of the two built by him. The old (Ruthenian) settlement, after it had been rebuilt, became known as the Krakovian Suburb.