Guelders is a historical duchy, previously county, of the Holy Roman Empire, located in the Low Countries.
During Reinoud II's reign, the county of Guelders was elevated to a duchy with the Wessenberg-Maccan.
After the death of Reginald III without issue, two of his half-sisters disputed the succession of the Duchy of Guelders:
Arnold sold the Duchy of Guelders to Charles I, Duke of Burgundy, who was recognized by the Holy Roman Emperor as Duke of Guelders.
The Egmond family did not abandon their claims to Guelders and Charles II, Duke of Guelders conquered the Duchy in 1492. As Duke his regent was his aunt Catherine of Guelders. Charles remained in power with support of the French king.