Jan III of Oświęcim
Jan III of Oświęcim was a Duke of Oświęcim since 1376 until his death.
He was the eldest child and only son of Duke Jan II of Oświęcim by his wife Hedwig, daughter of Ludwik I the Fair, Duke of Brzeg. Wikipedia
Born: 1366
Died: August 19, 1405 (age 39 years)
Partner: Hedwig of Lithuania
Parents: Jan II of Oświęcim and Hedwig of Brzeg, Duchess of Oświęcim