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.
Lordship of Diepholz The County of Diepholz (West Low German: "Diepholt"), that was first known as the Lordship of Diepholz, was a territory in the Holy Roman Empire in the Lower-Rhenish-Westphalian Circle. It was ruled by the Noble Lords, later Counts, of Diepholz from the late tenth century until 1585, when it was mostly incorporated into the Duchy of Brunswick-Lüneburg.