- 2 June 1444), a diplomat and Bishop of Trento, titular Bishop of Chur, titular Cardinal of Damascus, and Patriarch of Aquileia. Casimir II (1401/03 - 15 September 1442). Trojden II (1403/06 - 25 July 1427). Władysław I (1406/09 - 11/12 December 1455). Alexandra (1407/10 - ca. 1426). Maria (1408/15–14 February 1454), married on 24 June 1432 to Bogislaw IX, Duke of Pomerania. Anna (24 April 1411 - bef. 7 Feb 1435), married bef. 26 May 1427 to Michael Žygimantaitis, a Lithuanian prince. Catherine (1413/16 - betw. 2 June 1479/5 July 1480), married bef. 21 August 1439 to Michael Žygimantaitis, a Lithuanian prince (widower of her sister). Grandchildren of Alexandra and Siemowit IV included Frederick III, Holy Roman Emperor, Przemyslaus II, Duke of Cieszyn, Sophie of Pomerania, Duchess of Pomerania and Dorothy Garai, queen of Bosnia. Prior to his marriage, Siemowit IV fathered an illegitimate son, Miklusz (also called Mikołaj; born before 1387), who was legitimated on 29 June 1417 by Emperor Sigismund. Nothing more is known about him. References 1352 births 1426 deaths Dukes of Masovia People in the Battle of Grunwald