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.
Bolesław was born in 1308 to Trojden I of Masovia Duke of Czersk and Maria, daughter of Yuriy I , prince of Halicz. Since his father was still a ruler of his lands, in 1323 he became the Duke of Halicz. In 1331 he married the daughter of Giedymin, ruler of Lithuania, sister of Aldona Ana 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. After his death his domain was inherited by Poland.
Masovia (Polish: Mazowsze) is a geographical and historical region situated in central Poland with its capital in Warsaw.
Masovia was conquered probably by Mieszko I, duke of Polans and first historical ruler of Poland in the 10th century.
Following fragmentation of Poland after death of Boleslaus III of Poland Masovia was governed by his son Boleslaus IV of Poland, later high-duke of Poland 1146-1173 and other Dukes of Masovia from the local branch of the Piast dynasty.
Boleslaus the Brave (Polish: Bolesław I Chrobry) (966/967 - July 17, 1025) of the Piast family, son of Mieszko I and of his first wife, the Czech princess Dobrawa, ruled as duke of Poland from 992 to 1025 and reigned as King of Poland in 1025.
In 984 Boleslaus married Rikdaga, the daughter of Riddag (Rikdag, Ricdag), the margrave of Meissen.
Boleslaus for the first time unified all the provinces that subsequently came to comprise the traditional territory of Poland: Greater Poland, Little Poland, Masovia, Silesia and Pomerania.
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