Proper noun
Halych
A historic city on the Dniester river in western Ukraine.
Kęstutis requested King Casimir of Poland to mediate with the pope in hopes of converting Lithuania to Christianity, but the result was negative, and Poland took from Lithuania in 1349 the Halych area and some Ruthenian lands further north. Source: Internet
He ruled the Principality of Halych from 1188 until 1189/1190, and again between 1208/1209 and 1210. Source: Internet