of Żagań. They had three sons: Wenceslaus I (c. 1418 – before 29 July 1468). Przemysław (1425 – December 1484). Jan IV (1426/30 – by 21 February 1497). By 1433, Casimir I married secondly with Margareta (1410 – 5 July 1459), daughter of Jan II of Iron, Duke of Racibórz. They had no children. References Genealogical database by Herbert Stoyan Genealogy of the House of Cieszyn 1396 births 1434 deaths Piast dynasty