Question: Wilhelm Wiegand is best known for and his publications involving a man that was King of Prussia beginning in what year?

Context articles: List of monarchs of Prussia
Prince Augustus of Prussia
Justice of the Common Pleas
Frederick the Great
Frederick William IV of Prussia
Frederick William I of Prussia
Orangery Palace
Frederick III, German Emperor
Duppel Storm Cross
Wilhelm Wiegand

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.
Prince Friedrich Wilhelm Heinrich August of Prussia (19 September 1779 - 19 July 1843), known in English as Prince Augustus, was a Prussian general.
 Born on Friedrichsfelde Palace, he was the youngest son of Prince Augustus Ferdinand of Prussia, the brother of King Frederick the Great, and Margravine Elisabeth Louise of Brandenburg-Schwedt.
Justice of the Common Pleas was a puisne judicial position within the Court of Common Pleas of England and Wales, under the Chief Justice.
 The Common Pleas was the primary court of common law within England and Wales, dealing with "common" pleas (civil matters between subject and subject).
 It was created out of the common law jurisdiction of the Exchequer of Pleas, with splits forming during the 1190s and the division becoming formal by the beginning of the 13th century.
 The court became a key part of the Westminster courts, along with the Exchequer of Pleas (qualified to hear cases involving revenue owed to the King) and the Court of King's Bench (authorised to hear cases involving the King), but with the Writ of Quominus and the Statute of Westminster, both tried to extend their jurisdiction into the realm of common pleas.
 As a result, the courts jockeyed for power.
 In 1828 Henry Brougham, a Member of Parliament, complained in Parliament that as long as there were three courts unevenness was inevitable, saying that "It is not in the power of the courts, even if all were monopolies and other restrictions done away, to distribute business equally, as long as suitors are left free to choose their own tribunal", and that there would always be a favourite court, which would therefore attract the best lawyers and judges and entrench its position.
 The outcome was the Supreme Court of Judicature Act 1873, under which all the central courts were made part of a single Supreme Court of Judicature.
 Eventually the government created a High Court of Justice under Lord Coleridge by an Order in Council of 16 December 1880.
 At this point, the Common Pleas formally ceased to exist.
Frederick II (German: "Friedrich" ; 24 January 171217 August 1786) was King of Prussia from 1740 until 1786, the longest reign of any Hohenzollern king.
 His most significant accomplishments during his reign included his military victories, his reorganization of Prussian armies, his patronage of the arts and the Enlightenment in Prussia, and his final success against great odds in the Seven Years' War.
 Frederick was the last titled King in Prussia and declared himself King of Prussia after achieving full sovereignty for all historical Prussian lands.
 Prussia had greatly increased its territories and became a leading military power in Europe under his rule.
 He became known as Frederick the Great ("Friedrich der Große ") and was affectionately nicknamed "Der Alte Fritz " ("Old Fritz") by the Prussian and later by all German people.
Frederick William IV (German: "Friedrich Wilhelm IV."
 ; 15 October 17952 January 1861), the eldest son and successor of Frederick William III of Prussia, reigned as King of Prussia from 1840 to 1861.
 Also referred to as the "romanticist on the throne", he is best remembered for the many buildings he had constructed in Berlin and Potsdam, as well as for the completion of the Gothic Cologne Cathedral.
 In politics, he was a conservative, and in 1849 rejected the title of Emperor of the Germans offered by the Frankfurt Parliament as not the Parliament's to give.
 In 1857, he suffered a stroke and was left incapacitated until his death.
Frederick William I (German: "Friedrich Wilhelm I" ) (14 August 1688 – 31 May 1740), known as the 'Soldier King,' was the King in Prussia and Elector of Brandenburg from 1713 until his death, as well as the father of Frederick the Great.
 He was in personal union the sovereign prince of the principality of Neuchâtel.
The Orangery Palace (German: "Orangerieschloss" ) is a palace located in the Sanssouci Park of Potsdam, Germany.
 also known as the New Orangery on the Klausberg, or just the Orangery.
 It was built on behest of the "Romantic on the Throne", King Friedrich Wilhelm IV (Frederick William IV of Prussia) from 1851 to 1864.
Frederick III (German: "Friedrich" ; 18 October 1831 – 15 June 1888) was German Emperor and King of Prussia for ninety-nine days in 1888, the Year of the Three Emperors.
 Friedrich Wilhelm Nikolaus Karl, known informally as "Fritz", was the only son of Emperor Wilhelm I and was raised in his family's tradition of military service.
 Although celebrated as a young man for his leadership and successes during the Second Schleswig, Austro-Prussian and Franco-Prussian wars, he nevertheless professed a hatred of warfare and was praised by friends and enemies alike for his humane conduct.
 Following the unification of Germany in 1871 his father, then King of Prussia, became the German Emperor.
 Upon Wilhelm's death at the age of ninety on 9 March 1888, the thrones passed to Frederick, who had by then been German Crown Prince for seventeen years and Crown Prince of Prussia for twenty-seven years.
 Frederick was suffering from cancer of the larynx when he died on 15 June 1888, aged fifty-six, following unsuccessful medical treatments for his condition.
The Düppel Storm Cross (German: "Düppeler-Sturmkreuz" ) was a military medal of the Kingdom of Prussia.
 The cross was awarded to Prussian participants in the Battle of Dybbøl ("Düppeler Schanzen") which took place on 18 April 1864, during the Second Schleswig War.
 Established by Wilhelm, King of Prussia on 18 October 1864, the cross was initially awarded to combatants and noncombatants who directly participated in the battle.
 The following year, versions were created for those troops held in reserve at the battle and members of the Johanniter Orden who participated in the battle.
Wilhelm Wiegand (5 November 1851, Ellrich – 8 March 1915, Strasbourg) was a German archivist and historian.
 He is best known for his research of Alsatian history and his publications involving Frederick the Great.