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Having a reunified Masovia, it regained its independence, there Siemowit III promulgates a customary law in 1377. He reformed the administration, justice and the monetary system. In 1373/1374 he gave the regions of Warsaw and Rawa to his sons, Siemowit IV of Masovia and Janusz I of Warsaw .
Siemowit IV (Ziemowit IV), also known as Siemowit IV the Younger (pl: Siemowit IV Młodszy; ca. 1353/1356 – 21 January 1426), was a Polish prince member of the House of Piast from the Masovian branch, from 1373/74 Duke of Rawa, and after the division of the paternal inheritance between him and his brother in 1381, ruler over Rawa, Płock, Sochaczew, Gostynin, Płońsk and Wizna, since 1386 ...
Konrad I of Masovia. Konrad I of Masovia (ca. 1187/88 [1] – 31 August 1247), from the Polish Piast dynasty, was the sixth Duke of Masovia and Kuyavia from 1194 until his death as well as High Duke of Poland from 1229 to 1232 and again from 1241 to 1243.
Jul 26, 2023 · Between 1207 and 1210 Konrad married Agafia of Rus, daughter of Prince Svyatoslav III Igorevich. They had the following children: 1.Boleslaw I of Masovia (c. 1210 - 17 April 1248), Duke of Masovia (1247—1248) 2.Casimir I of Kuyavia (born between 1210 and 1213 - died 14 Dec 1267) Prince of Kuyavia (1247–1267)
Bolesław II of Masovia or Bolesław II of Płock (pl: Bolesław II mazowiecki (płocki); ca. 1253/58 – 20 April 1313), was a Polish prince, member of the House of Piast, Duke of Masovia during 1262-1275 jointly with his brother, after 1275 sole ruler over Płock, after 1294 ruler over all Masovia and Duke of Kraków and Sandomierz during 1288-1289.
Margaret was a daughter of Siemowit III of Masovia and his wife Euphemia of Opawa. Her paternal grandparents were Trojden I of Masovia and his wife Maria, daughter of Yuri I of Galicia and Euphemia of Kuyavia. Life. In 1369 Margaret married her first husband Casimir IV, Duke of Pomerania, son of Bogislaw V, Duke of Pomerania and Elizabeth of ...
