Liubartas

Liubartas (died c. 1385), youngest son of Grand Duke Gediminas of Lithuania, was the last ruler of Galicia–Volhynia. About 1321 he married Andrew of Galicia's daughter and received Lutsk. After Yuri II Boleslav was poisoned in 1340, rebel nobles invited him to rule.

In 1349 Casimir III took all but eastern Volhynia, and Liubartas was captured in 1351; the 1366 treaty left him eastern Volhynia, and after Casimir's death in 1370 he seized all of Volhynia. He backed Kęstutis against Jogaila and built Lutsk Castle.