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Yuri II Boleslav
|Yuri II of Galicia|
|King of Rus'|
|Predecessor||Andrew and Leo II of Galicia|
|Successor||Casimir 'The Great'|
|Died||c. 1340 (aged c. 30)|
|Spouse||Eufemia (daughter of Gediminas)|
|Father||Trojden I of Masovia|
|Mother||Maria of Galicia|
Yuri II Boleslav (1305/1310 – April 7, 1340), also known as Bolesław-Jerzy II, was a ruler of the Polish Piast dynasty who ruled the originally Ruthenian principality of Galicia. After his death started the Galicia–Volhynia Wars over the succession of Galicia and Volhynia.
Bolesław was born between 1305 and 1310 to Trojden I of Masovia from the Piast dynasty, Duke of Czersk and Maria, daughter of Yuri I, prince of Galicia. Since his father was still a ruler of the family's Masovian lands, in 1323 Bolesław, renamed Jerzy, became Prince of Galicia. He also received the Duchy of Belz after the childless death of Andrew of Galicia. In 1331, he married the daughter of Grand Duke of Lithuania Gediminas and sister of Aldona of Lithuania, wife of Casimir III of Poland. The name of Bolesław's wife is disputed. T. Narbutt wrote that her pagan name was Eufemia and her Christian name was Maria. Oswald Balzer supposed that her Christian name was Eufemia. Kazimierz Jasiński supposed that whole Narbutt's account was fabrication.
In a treaty of 1338 Bolesław Jerzy offered Casimir III of Poland succession to the throne of Galicia-Volhynia. Duke Boleslaw was supported by the many townspeople living there. In 1324, Boleslaw located the towns of Volodymyr-Volynskyi on Magdeburg law, and Sanok in 1339. He was poisoned in 1340 by orthodox boyars and died without an heir, before his father who continued rule Masovian principality.
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