Yuri II Boleslav (Ukrainian: Юрій-Болеслав Тройденович, romanized: Yurii-Boleslav Troidenovych; Polish: Bolesław Jerzy II; Latin: Georgius; c. 1305/1310 – April 7, 1340), was King of Ruthenia and Dominus of the Galicia–Volhynian lands (1325–1340). He was the son of Trojden I, Duke of Masovia, a member of the Piast dynasty and the grandson of Yuri I of Galicia. His murder prompted a war of succession, known as the Galicia–Volhynia Wars.
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Trojden I, Duke of Masovia in the context of Duchy of Czersk
The Duchy of Czersk was a feudal district duchy in Masovia, centered on the Czersk Land. Its capital was Czersk.
The country was established in 1275, in the partition of the Duchy of Masovia, with duke Konrad II becoming its ruler. After his death, the duchy was unified with the Duchy of Płock, forming the Duchy of Masovia, on 24 June 1294. The state was again reestablished in 1310, with Trojden I, as its first ruler. It existed until 5 November 1370, when, under the rule of duke Siemowit III, duchies of Czersk, Rawa, and Warsaw were unified into the Duchy of Masovia. It was once again reestablished in 1471, from the part of the territories of the duchies of Płock and Warsaw. In 1488, it incorporated the Duchy of Warsaw, into its territory. It existed until 1495, when, with the incorporation of the Duchy of Płock into the Kingdom of Poland, it remained the only state in Masovia, and subsequently, got reformed into the Duchy of Masovia.