Yuri II Boleslav (1305/1310 – April 7, 1340), also known as Bolesław-Jerzy II, was the King and Kniaz (Prince) of Ruthenia, and Dominus of the lands of Volhynia and Galicia (1325-1340), from the Polish Piast dynasty. After his death started the Galicia–Volhynia Wars over the succession of Kingdom of Ruthenia.
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 Yuri , 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 Yuri ІІ Bolesław offered Casimir III of Poland succession to the throne of Galicia-Volhynia. In 1324, Yuri located the towns of Volodymyr 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.
After Yuri ІІ Bolesław death the Galicia–Volhynia Wars were several wars fought in the years 1340–1392 over the succession in the Kingdom of Ruthenia.
| Yuri II of Galicia | |
|---|---|
 |
|
| King of Ruthenia | |
| Reign | 1323–1340 |
| Predecessor | Andrew and Leo II of Galicia |
| Successor | Liubartas |
| Born | c. 1305-10 |
| Died | c. 1340 (aged c. 30) |
| Spouse | Eufemia (daughter of Gediminas) |
| House | Piast |
| Father | Trojden I of Masovia |
| Mother | Maria of Galicia |