Principality of Halych
Vasylko Rostyslavych extensively colonized the territories southeast of Terebovlia by employing Turkic peoples (Berendeys, Torks, and Pechenegs), and he annexed Ponyzia, thereby securing it against nomadic raiders. Halych gained importance as a political and economic center; other important cities and fortresses included Terebovlia, Mykulyn (now Mykulyntsi), Chern (now Chernivtsi), Vasyliv (Bukovyna), Onut, Kuchelemyn, Bakota, Ushytsia, and Kalius. After Vasylko Rostyslavych's death in 1124, Halych principality seceded, and by 1141 Terebovlia principality had become a part of the Principality of Halych. After the Rostyslavych dynasty died out, it was briefly an appanage principality under Iziaslav Volodymyrovych.