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.
Isenburg-Arnfels Isenburg-Arnfels was the name of a state of the Holy Roman Empire, located in the Bad Hönningen area in modern Rhineland-Palatinate, Germany.