Career
He was also archdeacon at the prince-bishopric of Liège and the son of William of Jülich and Maria, a daughter of Guy of Dampierre, Count of Flanders. The Flemish resistance led to the unexpected victory over the French during the Battle of the Golden Spurs in 1302. William of Jülich gained an other victory against the French in the Battle of Arques (1303).
In 1304 however, the French king returned with an army and defeated the Flemings during the Battle of Mons-en-Pévèle.
William died during this battle.
