Wilhelm von Jülich, Herzog von Geldern und Jülich

https://en.wikipedia.org/wiki/William_I_of_Guelders_and_J%C3%BClich

William I of Guelders and Jülich KG (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.

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Wilhelm did marry Catharina of Bavaria (Bayern) but they had no children.

William married in 1379 Catharina of Bavaria (1361 – 11 November 1400), daughter of Albert I, Duke of Bavaria. The marriage remained childless, and Katherine died in Hattem on 11 November 1400. Upon his death in 1402, William was buried next to his wife at Monnikhuizen monastery near Arnhem,

However, Wilhelm did have illegitimate children with several unindentified mistresses. One of these women was the mother of Maria von Julich.

He started a campaign to extend the Gelre territory; this would become known as the start of the Gelre Wars.

Between 1383 and 1393 William also participated in several of the Teutonic Crusades in Prussia . His marriage with Catherine remained childless and his brother Reinoud van Gulik became the new Duke Reinoud IV.

• PaulBuddeHistory.com Gelre