Boleslaw was born in 1308 to Trojden I of Masovia from Piast dynasty, Duke of Czersk (Masovia) and Maria, daughter of Yuri I, prince of Galicia. Since his father was still a ruler of the family's Masovian lands, in 1323 Boleslaus, renamed Yuri, became Prince of Galicia.
Trojden I, Duke of Masovia - Trojden I (1284/86 – 13 March 1341), was a Polish prince member of the House of Piast, Duke of Czersk since 1310, ruler over Warsaw and Liw since 1313, regent of Płock during 1336–1340. Trondenes District Court - Trondenes District Court (Norwegian: Trondenes tingrett) is a district court located in the town of Harstad in Troms county, Norway.
Sophia of Masovia (257 words) exact match in snippet view article find links to article March 1543 ) was a Princess of Masovia, daughter of Konrad III Rudy, Duke of Masovia and his wife Anna Radziwiłł.
Oct 12, 2020 · his mother → Książę Trojden I ks. Piast-Mazowiecki, książę her father → Bolesław II Mazowiecki his father → Siemowit I his father → Konrad I of Masovia his father → Casimir II the Just, High Duke of Poland his father → Bolesław III Piast, Wrymouth, Duke his father → Władysław I Herman, Duke
The divided Masovia was then ruled by: Rawa [Mazowiecka] prince Siemowit II, Czersk prince Trojden I and Płock prince Wacław, who on January 2, 1326 in Brodnica signed a defence treaty with Teutonic knights.
Prior to his imperial coronation, he was duke of the Inner Austrian lands of Styria, Carinthia and Carniola from 1424, and also acted as regent over the Duchy of Austria (as Frederick V) from 1439. He was elected and crowned King of Germany (as Frederick IV ) in 1440. 
MASOVIA - KUJAVIA . 1300-1316 child of Siemowit ... Trojden I 1284-1341 part 1: Euphemia X 1321 ... duke of Gniewkowo X 1359 princess of Opole
MASOVIA - KUJAVIA . 1138-1194. Piast: Kasimir II X 1163 ... duke of Opole and Ratibor 1220-1246 2X 1252 ... Trojden I X 1308 Maria princess of Halicz
Nobility. She was born at Warsaw as daughter of Duke Siemovit IV of the Masovians and his wife Alexandra of Lithuania, (who was a sister of Wladyslaw II Jagiello, King of Poland). In 1412 she became the second wife of Duke Ernest the Iron of Austria in Styria, Carinthia and Carniola. She bore him nine children,...
Земавіт IV Плоцкі ці Куяўскі (польск.: Siemowit (Ziemowit); 1352 — 21 студзеня 1426 года) — князь раўскі (1373/1374-1426), плоцкі (1381—1426), візненскі (1381—1382, 1401—1426) і белзскі (1388—1426), прадстаўнік Мазавецкай лініі Пястаў.