In the early 1320s he married a daughter of Andrew of Galicia and ruled Lutsk with Liubar (today town in Zhytomyr Oblast) in eastern Volhynia.

Boleslaw-Yuri was a son of Trojden I, Duke of Masovia from the Piast dynasty, a cousin of Władysław I, and nephew of Gediminas' son-in-law Wenceslaus of Płock.

[3] Despite the support from his brothers Algirdas and Kęstutis, Liubartas lost all territories except for eastern Volhynia with Lutsk to Casimir III of Poland in 1349.

[1] The territories changed again only in 1569, when Volhynia, including Lutsk, was transferred to Poland by the Union of Lublin.

He married for the second time c. 1350 to an unnamed daughter of Konstantin of Rostov, a relative of Simeon of Moscow.