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?
Adolf van Nieuwenaar Adolf van Nieuwenaar, Count of Limburg and Moers (also: Adolf von Neuenahr) (c. 1545 – 18 October 1589) was a statesman and soldier, who was stadtholder of Overijssel, Guelders and Utrecht for the States-General of the Netherlands during the Eighty Years' War.
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.