Margaret of Brieg German noble (1342–1386) Parents Agnes of Głogów-Żagań Louis I of Brzeg Children Katherine of Bavaria Margaret of Bavaria Albert II, Duke of Bavaria William II, Duke of Bavaria John III, Duke of Bavaria Joanna Sophia of Bavaria Joanna of Bavaria Siblings Catherine of Brzeg Hedwig of Brzeg, Duchess of Oświęcim Henry VII of Brzeg Partners Albert I, Duke of Bavaria