Boleslaus George II of Halych
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Bolesław Jerzy II of Mazovia (Polish Bolesław Jerzy II Mazowiecki, also known as "of Galicia", Boleslaw-Yuri II, and Jerzy-Bolesław Trojdenowicz, 1308 – April 7, 1340) was a ruler of the Polish Piast dynasty who reigned in the originally Ruthenia
Ruthenia
Ruthenia is the Latin word used onwards from the 13th century, describing lands of the Ancient Rus in European manuscripts. Its geographic and culturo-ethnic name at that time was applied to the parts of Eastern Europe. Essentially, the word is a false Latin rendering of the ancient place name Rus...

n principality of Galicia. After his death started the Galicia–Volhynia Wars over succession of Galicia and Volhynia.

Boleslaw was born in 1308 to Trojden I of Masovia from the Piast dynasty
Piast dynasty
The Piast dynasty was the first historical ruling dynasty of Poland. It began with the semi-legendary Piast Kołodziej . The first historical ruler was Duke Mieszko I . The Piasts' royal rule in Poland ended in 1370 with the death of king Casimir the Great...

, Duke of Czersk (Masovia) and Maria, daughter of Yuri I
George I of Halych
Yuri I of Galicia was prince of Belz and King of Galicia-Volhynia or King of Rus' ....

, 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
Duchy of Belz
Duchy of Belz or principality of Belz was a petty duchy, formed in the late 12th century in Kievan Rus. During its history the duchy was a constituent part of some other political entities such as the Kingdom of Rus, the Kingdom of Hungary, Duchy of Masovia when eventually in the late 14th century...

 after the childless death of Andrew of Galicia
Andrew of Galicia
Andriy II Yuriyevych or Andrew of Galicia was the last Rus' king of Galicia-Volhynia in 1308–1323 . He was the son of Yuriy I whom he succeeded on the royal throne of Galicia. His mother was Euphemia of Kuyavia. After the death of his father, he ruled the kingdom together with his...

. In 1331 he married Eufemija, daughter of Grand Duke of Lithuania Gediminas and sister of Aldona of Lithuania, wife of Casimir III of Poland
Casimir III of Poland
Casimir III the Great , last King of Poland from the Piast dynasty , was the son of King Władysław I the Elbow-high and Hedwig of Kalisz.-Biography:...

. In a treaty of 1338 Bolesław Jerzy offered Casimir III of Poland
Casimir III of Poland
Casimir III the Great , last King of Poland from the Piast dynasty , was the son of King Władysław I the Elbow-high and Hedwig of Kalisz.-Biography:...

 succession to the throne of Galicia-Volhynia. Duke Boleslaw was supported by the many German townspeople already living there. In 1324 Boleslaw located the towns of Volodymyr-Volynskyi
Volodymyr-Volynskyi
Volodymyr-Volynsky is a city located in Volyn Oblast, in north-western Ukraine. Serving as the administrative centre of the Volodymyr-Volynsky District, the city itself is also designated as a separate raion within the oblast...

 on Magdeburg law, and Sanok
Sanok
Sanok is a town in south-eastern Poland with 39,110 inhabitants, as of 2 June 2009. It's the capital of Sanok County in the Subcarpathian Voivodeship. Previously, it was in the Krosno Voivodeship and in the Ruthenian Voivodeship , which was part of the Lesser Poland province...

 in 1339. He was poisoned in 1340 by orthodox
Eastern Orthodox Church
The Orthodox Church, officially called the Orthodox Catholic Church and commonly referred to as the Eastern Orthodox Church, is the second largest Christian denomination in the world, with an estimated 300 million adherents mainly in the countries of Belarus, Bulgaria, Cyprus, Georgia, Greece,...

 boyar
Boyar
A boyar, or bolyar , was a member of the highest rank of the feudal Moscovian, Kievan Rus'ian, Bulgarian, Wallachian, and Moldavian aristocracies, second only to the ruling princes , from the 10th century through the 17th century....

s and died without an heir, before his father who continued rule Masovian principality.

After Bolesław Jerzy's death the Kingdom of Galicia was gradually annexed by the kingdom of Poland between 1340 and 1366, during the reign of Casimir III of Poland
Casimir III of Poland
Casimir III the Great , last King of Poland from the Piast dynasty , was the son of King Władysław I the Elbow-high and Hedwig of Kalisz.-Biography:...

.
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