Question: 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?

Context paragraphs:
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 Württemberg: The Duchy of Württemberg (German: "Herzogtum Württemberg" ) was a duchy located in the south-western part of the Holy Roman Empire.  It was a member of the Holy Roman Empire from 1495 to 1806.  The dukedom's long survival for nearly four centuries was mainly due to its size, being larger than its immediate neighbors.  During the Protestant Reformation, Württemberg faced great pressure from the Holy Roman Empire to remain a member.  Württemberg resisted repeated French invasions in the 17th and 18th centuries.  Württemberg was directly in the path of French and Austrian armies who were engaged in the long rivalry between the House of Bourbon and the House of Habsburg.  In 1803, Napoleon raised the duchy to be the Electorate of Württemberg of the Holy Roman Empire, and when he abolished the Empire in 1806, the Electorate was elevated as the Kingdom of Württemberg.

Pranckh: Pranckh is the name of an ancient Austrian noble family, descending from Pranckh Castle, near Sankt Marein bei Knittelfeld in the former March and later Duchy of Styria.  The family's origins date back to the year 1135, when "Wolfkerus de Branka" attested a charter regarding an endowment to Admont Abbey.  In later parts of history the family rose from Knights to Reichsfreiherren "(Barons of the Holy Roman Empire)" and Reichsgrafen "(Imperial Counts of the Holy Roman Empire)".

Guelders: Guelders or Gueldres (Dutch: "Gelre" , German: "Geldern" ) is a historical county, later duchy of the Holy Roman Empire, located in the Low Countries.

French Wars of Religion: The French Wars of Religion, or Huguenot Wars of the 16th century, are names for a period of civil infighting, military operations and religious war primarily fought between Roman Catholics and Huguenots (Reformed Protestants) in the Kingdom of France.  The conflict involved several independent principalities: the Duchy of Lorraine, the Duchy of Savoy, the Kingdom of Navarre, and parts of Burgundy which have since been incorporated into France.  And it occasionally spilled beyond the French region, for instance in the war with Spain, from 1595-1598, into northern Italy, some of the German states of the Holy Roman Empire, and the Duchy of Burgundy possessions in the Low Countries.

Episcopal principality of Utrecht: The Bishopric of Utrecht (1024–1528) was a civil principality of the Holy Roman Empire in the Low Countries, in present Netherlands, which was ruled by the bishops of Utrecht as princes of the Holy Roman Empire.

List of monarchs of Prussia: The monarchs of Prussia were members of the House of Hohenzollern who were the hereditary rulers of the former German state of Prussia from its founding in 1525 as the Duchy of Prussia.  The Duchy had evolved out of the Teutonic Order, a Roman Catholic crusader state and theocracy located along the eastern coast of the Baltic Sea.  The Teutonic Knights were under the leadership of a Grand Master, the last of whom, Albert, converted to Protestantism and secularized the lands, which then became the Duchy of Prussia.  The Duchy was initially a vassal of the Kingdom of Poland, as a result of the terms of the Prussian Homage whereby Albert was granted the Duchy as part of the terms of peace following the Prussian War.  When the main line of Prussian Hohenzollerns died out in 1618, the Duchy passed to a different branch of the family, who also reigned as Electors of Brandenburg in the Holy Roman Empire.  While still nominally two different territories, Prussia under the suzerainty of Poland and Brandenburg under the suzerainty of the Holy Roman Empire, the two states are known together historiographically as Brandenburg-Prussia.  Following the Second Northern War, a series of treaties freed the Duchy of Prussia from any vassalage to any other state, making it a fully sovereign Duchy in its own right.  This complex situation (where the Hohenzollern ruler of the independent Duchy of Prussia was also a subject of the Holy Roman Emperor as Elector of Brandenburg) laid the eventual groundwork for the establishment of the Kingdom of Prussia in 1701.  For diplomatic reasons, the rulers of the state were known as the King in Prussia from 1701 to 1772; largely because they still owed fealty to the Emperor as Electors of Brandenburg, the "King in Prussia" title (as opposed to "King of Prussia") avoided offending the Emperor.  As the Prussian state grew through several wars and diplomatic moves throughout the 18th century, it became apparent that Prussia had become a Great Power that did not need to submit meekly to the Holy Roman Empire.  By 1772, the pretense was dropped, and the style "King of Prussia" was adopted.  Thus it remained until 1871, when in the aftermath of the Franco-Prussian War, the King of Prussia Wilhelm I was crowned German Emperor.  From that point forward, though the Kingdom of Prussia retained its status as a constituent state of the German Empire, all remaining Kings of Prussia also served as German Emperor, and that title took precedence.

Herman de Lynden: Herman de Lynden (Liège, 1547- June 5, 1603, Reckheim), baron of and of the Holy Roman Empire, was a military leader serving the Prince-Bishopric of Liège and the Holy Roman Empire.  He led troops during the Eighty Years' War and the Cologne War.  He also held several high-ranking positions, notably Governor of Cologne and Grand-Mayor of Liège.

Free Imperial City of Aachen: The Free Imperial City of Aachen, known in English by its French name of Aix-la-Chapelle, was a Free Imperial City and spa of the Holy Roman Empire west of Cologne and southeast of the Low Countries, in the Lower Rhenish–Westphalian Circle.  The pilgrimages, the Coronation of the Holy Roman Emperor, flourishing industries and the privileges conferred by various emperors made it one of the most prosperous market towns of the Holy Roman Empire.

Bandes d'ordonnance: Bandes d'ordonnance (French) or Benden van ordonnantie (Dutch) were elite heavy cavalry formations recruited from the aristocracy in the early-modern Low Countries.  They were originally formed by Charles the Bold, Duke of Burgundy, and became an integral part of the military organization of the Low Countries from the mid-fifteenth to late-sixteenth centuries, up to the first years of the Eighty Years' War.  They continued to exist into the seventeenth century with far less military importance, although a command in a "Bande d'ordonnance" was still a considerable social distinction.

Supporting paragraphs: Adolf van Nieuwenaar Guelders
Answer: Guelders