Halych principality [Галицьке князівство; Halyts’ke knyazivstvo]. A principality of medieval Kyivan Rus’ that emerged in the mid 12th century. Prince Volodymyrko Volodarovych, who inherited the Zvenyhorod principality in 1124, the Peremyshl principality in 1129, and the Terebovlia principality and Halych land in 1141, established his capital in princely Halych in 1144. Volodymyrko's son, Yaroslav Osmomysl, the pre-eminent prince of the Rostyslavych house (the descendants of Rostyslav Volodymyrovych), enlarged Halych principality during his reign (1153–87) to encompass all the lands between the Carpathian Mountains and the Dnister River as far south as the lower Danube River. Trade and salt mining stimulated the rise of a powerful boyar estate in Galicia. The boyars often opposed the policies and plans of the Galician princes and undermined their rule by provoking internal strife and supporting foreign intervention. When Volodymyr Yaroslavych, the last prince of the Rostyslavych house, died in 1199, the boyars invited Prince Roman Mstyslavych of Volhynia to take the throne. Roman Mstyslavych united Galicia with Volhynia and thus created the Principality of Galicia-Volhynia.
[This article originally appeared in the Encyclopedia of Ukraine, vol. 2 (1988).]