Yuri II Boleslav
Yuri II Boleslav, was King of Ruthenia and Dominus of the lands of Galicia–Volhynia. A foreigner and a Catholic by birth, he was the son of Trojden I, Duke of Masovia and a member of the Polish Piast dynasty. Wikipedia
Born: 1308, Mazovia
Died: April 7, 1340 (age 32 years)
Parents: Trojden I, Duke of Masovia and Maria of Galicia
Grandparents: Yuri I of Galicia, Bolesław II of Masovia, Euphemia of Kuyavia, and more
Spouse: Eufemia Gediminaite (m. 1331)
Great-grandparents: Leo I of Galicia, Traidenis, Siemowit I of Masovia, and more