Ki vette feleségül William I of Guelders and Jülich-t?

William (5 March 1364 – 16 February 1402, Arnhem) was Duke of Guelders, as William I, from 1377 and Duke of Jülich, as William III, from 1393. William was known for his military activities, participating in the Prussian crusade five times and battling with neighbors in France and Brabant throughout his rule. His allies included Holy Roman Emperors, Charles IV and Wenceslaus, Richard II of England, and Conrad Zöllner von Rothenstein, the Grand Master of the Teutonic Knights. During his reign the duchies of Guelders and Jülich were temporarily unified.

Katherine of Bavaria (c. 1361–1400 AD, Hattem), was the eldest child of Albert I, Duke of Bavaria and his first wife Margaret of Brieg. She was Duchess of Guelders and Jülich by her marriage to William I of Guelders and Jülich.