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 ...
Siemowit IV , Duke of Masovia. b. ca. 1352 d. 1425 or 1426
Maria of Masovia; Siemowit V of Masovia; Władysław I of Masovia; Jadwiga of Masovia; Cymburgis of Masovia; Euphemia of Masovia; Amelia of Masovia; Trojden II of Płock; Catherine of Masovia; Casimir II of Masovia
Margaret of Masovia Polish: Małgorzata (before 1358 – 14 May 1388/4 April 1396) was Duchess of Pomerania and Brzeg, by her marriages to Casimir IV, Duke of Pomerania and then to Henry VII of Brzeg. She was a member of the House of Piast. Margaret was a daughter of Siemowit III of Masovia and his wife Euphemia of Opawa
9 October 2017. place of death. Gostynin. ... Siemowit V of Masovia. 1 reference. inferred from. ... Siemowit IV, Duke of Masovia. 0 references.
Euphemia of Masovia (Q527861) ... 9 October 2017. father. Siemowit IV. 0 references. ... Siemowit V of Masovia. 0 references. Władysław I of Masovia.
Frederick III (21 September 1415 – 19 August 1493) was Holy Roman Emperor from 1452 until his death. He was the first emperor of the House of Habsburg, and the fourth member of the House of Habsburg to be elected King of Germany after Rudolf I of Germany, Albert I in the 13th century and his predecessor Albert II of Germany.
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.
von Masovia (Polen) von Hapsburg) 1395 - 1429
Nota bene my own hometown, 30 km away to the east, was located in the allied duchy of Masovia, and its town charter was granted by the Masovian sovereign prince Siemowit V of Masowia in AD 1427.