What is the name of the historical county, later duchy of the Holy Roman Empire, located in the Low Countries that  Adolf van Nieuwenaar worked for in the  Eighty Years' War?
Guelders Guelders or Gueldres (Dutch: "Gelre" , German: "Geldern" ) is a historical county, later duchy of the Holy Roman Empire, located in the Low Countries.
Siege of Nijmegen (1591) The Siege of Nijmegen was a military engagement during the Eighty Years' War and the Anglo–Spanish War which took place from 17 to 21 October 1591. The Spanish garrison in Nijmegen was besieged by a Dutch and English force under Maurice of Nassau and Francis Vere respectively, which soon surrendered.