The Polish minority in Ukraine officially numbers about 144,130, of whom 21,094 (14.6%) speak Polish as their first language. The history of Polish settlement in the current territory of Ukraine dates back to 1030–31. In the Late Middle Ages, following the extinction of the Rurik dynasty in 1323, the Kingdom of Poland expanded eastwards in 1340 to include the lands of Przemyśl and in 1366, Kamianets-Podilskyi as well. The settlement of Poles became common there after the Polish–Lithuanian peace treaty signed in 1366 between Casimir III the Great of Poland, and Liubartas of Lithuania.