William I, Duke of Bavaria second son of Emperor Louis IV and Margaret II of Hainaut (1330–1389) Parents Margaret II, Countess of Hainaut Louis IV of Bavaria Children Elisabeth bastaard van Beieren Siblings Stephen II, Duke of Bavaria Agnes of Bavaria Beatrice of Bavaria Margaret of Bavaria, Duchess of Slavonia Louis V, Duke of Bavaria Otto V, Duke of Bavaria Elisabeth of Bavaria Matilda of Bavaria, Margravine of Meissen Albert I, Duke of Bavaria Louis II, Elector of Brandenburg Partners Catharina Gerrit Busendochter Maud, Countess of Leicester
