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.
Duchy of Livonia The Duchy of Livonia (Polish: "Księstwo Inflanckie" ; Lithuanian: "Livonijos kunigaikštystė" ; Latin: "Ducatus Ultradunensis" ; Estonian: "Üleväina-Liivimaa hertsogkond" ; Latvian: "Pārdaugavas hercogiste" ; also referred to as Polish Livonia or Inflanty) was a territory of the Grand Duchy of Lithuania—and later the Polish–Lithuanian Commonwealth—that existed from 1561 to 1621. It corresponds to the present-day areas of northern Latvia and southern Estonia.