After the fall of Kyiv Rus the principalities of Halych and Volodymyr-Volynskyi grew and prospered in Western Ukraine. In 1199 they were united by Prince Roman Mstyslavovych, a gifted military leader into the Halych-Volyn Principality. His successor Prince Daniel (Danylo) of Halych (1228—1264) continued his father’s work, further strengthening his state. He defended tits independence against the Hungarians, Teutonic knights, and Tatars. He was a subtle and cautious diplomat, and be promoted culture and developed the new cities of Lviv and Kholm.
In 1340 the state fell apart. Later Halychyna was incorporated into the Polish Kingdom and the Eastern Ukrainian territories fell to Lithuania. In 1569 the Polish-Lithuanian Commonwealth was formed. The long period of struggle of the Ukrainian people for their national and social liberation began.