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.
West Frisians The West Frisians (German: "Westfriesen" ) – or, more precisely, the Westlauwers Frisians – are those Frisian peoples in that part of Frisia administered by the Netherlands: the Province of Friesland, which is bounded in the west by the IJsselmeer and in the east by the River Lauwers (hence the name "Westlauwers", i.e., "west of the Lauwers").