In 1339 Count Reginald II of Guelders became a duke as ordered by Holy Roman Emperor Louis IV of Wittelsbach. When Reginald died without an heir in 1371, William I of Jülich inherited Guelders. In 1423 Guelders passed to the House of Egmond. Duke Adolf was fighting with his father Arnold about the inheritance of the land. Arnold came under pressure from the Burgundian duke Charles the Bold, who put him in prison in 1471. When Arnold died in 1473, Duke Charles added Guelders to his Burgundian Netherlands.