Boleslaus George II of Halych

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George II, Prince of Halych, Polish Bolesław Jerzy II Mazowiecki (Boleslaus George II of Masovia, also known as Yuriy II of Halicz and Bolesław Trojdenowicz) (1308-1340) was a ruler of the Piast dynasty who reigned the originally Ruthenian principality of Galicia (Central Europe).

Bolesław was born in 1308 to Trojden I of Masovia from Piast dynasty, Duke of Czersk and Maria, daughter of Yuriy I, prince of Halych. Since his father was still a ruler of the family's Masovian lands, in 1323 Boleslaus, renamed George, became the Duke of Halych. In 1331 he married the daughter of Gediminas, ruler of Lithuania, sister of Aldona Ona wife of Casimir III of Poland. In a treaty of 1338 Bolesław Jerzy offered Casimir III of Poland succession to the throne of Halicz. He was poisoned in 1340 and died heirless, before his father who continued rule Masovian principality.

After Boleslaus George's death Halych was gradually annexed by the kingdom of Poland between 1340 and 1366, during the reign of Casimir III of Poland.

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