Jan IV of Oświęcim
Jan IV of Oświęcim, was a Duke of Oświęcim during 1434–1456 and Duke of Gliwice from 1465 to 1482.
He was the third son of Duke Casimir I of Oświęcim by his first wife Anna, daughter of Duke Henry VIII of Żagań. Wikipedia
Born: Duchy of Oświęcim
Died: February 21, 1497, Krnov, Czechia
Great-grandparents: Przemyslaus I Noszak, Duke of Cieszyn, Vladislaus II of Opole, Henry V, Duke of Żagań, and more
Parents: Casimir I of Oświęcim and Anna żagańska
Grandparents: Katharina of Opole, Henry VIII the Sparrow, and Przemysław of Oświęcim
Children: Helena of Oświęcim
Partner: Barbara of Karniów