Question: When did the King who the most valuable sovereign was struck for die?

Context paragraphs:
Sovereign Trains: Sovereign Trains is a rolling stock operating company (ROSCO) formed in 2007 as part of the same group as Grand Central.  The company was initially formed to fund the purchase of rolling stock for Grand Central for its operations between London King's Cross and Sunderland, which Grand Central leased from Sovereign.  This amounted to six Class 43 power cars and 24 Mark 3 coaches to form three complete trains.  However in 2007, Sovereign entered into a partnership with Chinese manufacturer CSR Ziyang to market their new range of trains in Europe, with Grand Central committing to operate the "Polaris" DEMU, should its track-access agreement be extended.

Federal prince: Federal prince (German: "Bundesfürsten" , "Princes of the Federation") was the generic term for the royal heads of state (monarchs) of the various states making up the German Empire, with the exception of the states that were republics and Alsace-Lorraine which had a special status.  The empire was a federal state, with its constituent states remaining sovereign states.  Among the states, the majority were monarchies, 3 states were republics and Alsace-Lorraine was an imperial territory ruled by a steward.  The states became part of the German Empire by an 1871 treaty.  The head of the empire was granted the title German Emperor (with the title "Emperor of Germany" being deliberately avoided), and was simultaneously a federal prince as King of Prussia, the sovereign of its largest federal state.  Of the princely heads of state, 4 held the title King (König) (the Kings of Prussia, Bavaria, Saxony, and Württemberg), 6 held the title Grand Duke (Großherzog), 5 held the title Duke (Herzog), and 7 held the title Prince (i.e. Sovereign Prince, "Fürst").  The heads of state of the city republics, where the concepts of nobility and royalty did not exist, were of equal standing to the federal princes and held the titles First Mayor and President of the Senate (Hamburg), Mayor and President of the Senate (Lübeck), and President of the Senate and Mayor (Bremen).  The heads of state of the city republics were regarded as primi inter pares among the senators according to the states' republican constitutions, and these states were ruled by an oligarchy of hereditary Grand Burghers, also known as Hanseaten or patricians.

The Hangman's Daughter: The Hangman's Daughter (original title in German: "Die Henkerstochter" ) is a novel by Oliver Pötzsch.  First published in Germany by Ullstein Verlag in 2008, it was translated into English and issued digitally under the AmazonCrossing imprint in 2010.  A paper edition was released in English by Houghton Mifflin Harcourt in 2010.  The characters continue in the sequels "The Dark Monk" (2009) (German: "Die Henkerstochter und der schwarze Mönch" ), "The Beggar King" (2010) (German: "Die Henkerstochter und der König der Bettler" ), "The Poisoned Pilgrim" (German: "Der Hexer und die Henkerstochter" ) (2012), and "The Werewolf of Bamburg" (2015) (German: "Die Henkerstochter und der Teufel von Bamberg" ).  The latest published novel in the series is "The Play of Death" (2017) (German: "Die Henkerstochter und das Spiel des Todes" ).

Dave Kingman: David Arthur Kingman (born December 21, 1948), nicknamed "King Kong" and "Sky King", is a former Major League Baseball left fielder, first baseman, third baseman, and designated hitter.  The 6' 6" Kingman was a powerful hitter known for his long home runs, with one measured at over 530 feet.  He also struck out frequently, and usually posted a low batting average and on-base percentage.  His 1,816 strikeouts was the fourth-highest total in MLB history at the time of his retirement.  As a result of the increase in frequency of strikeouts in the intervening period, he currently ranks fifteenth as of August 2015.  Kingman finished in the top 25 voting for National League Most Valuable Player four times (1972, 1975, 1976, and 1979) and American League Most Valuable Player once (1984).

Coins of the Ukrainian hryvnia: Coins of the Ukrainian hryvnia were first minted in 1992.  Coins were first struck in 1992 for the new currency but were not introduced until September 1996.  Initially coins valued between 1 and 50 kopecks were issued.  In March 1997, 1 hryvnia coins were added; they are however rarely seen in circulation.  The note of the same value is far more commonly used.  Since 2004 several commemorative 1 hryvnia coins have been struck.  New coins have been produced annually since then and they make up a valuable aspect of the Ukrainian currency system.  Today, circulating coins exist in denominations of 1 kopiyka (i.e. or ₴0.01), 2, 5, 10, 25, 50 kopiyok, and ₴1.00.  Also minted are bullion (including gold, silver and platinum) and commemorative coins.  All of these are produced by the National Bank of Ukraine.

Edward VIII: Edward VIII (Edward Albert Christian George Andrew Patrick David; 23 June 1894 – 28 May 1972) was King of the United Kingdom and the Dominions of the British Empire, and Emperor of India, from 20 January 1936 until his abdication on 11 December the same year.

Sovereign immunity in the United States: In United States law, the federal government as well as state and tribal governments generally enjoy sovereign immunity from lawsuits, although in some cases this immunity has been waived by law.  Local governments in most jurisdictions enjoy immunity from some forms of suit, particularly in tort.  The Foreign Sovereign Immunities Act provides foreign governments, including state-owned companies, with a related form of immunity—state immunity—that shields them from lawsuits except in relation to certain actions relating to commercial activity in the United States.  The principle of sovereign immunity in US law was inherited from the English common law legal maxim "rex non potest peccare", meaning "the king can do no wrong."

Sovereign (British coin): The sovereign is a gold coin of the United Kingdom, with a nominal value of one pound sterling.  Prior to 1932 it was a fully circulating coin within Britain's then Gold Standard currency.  Today it is used as a bullion coin and is sometimes mounted in jewellery.  The most valuable sovereign is the British Edward VIII 1937 struck for Edward VIII who abdicated, therefore these coins never entered circulation, and an example of one was purchased at auction in 2014 for £516,000.

Letters Patent, 1947: The Letters Patent, 1947 (more formally, the Letters Patent Constituting the Office of Governor General and Commander-in-Chief of Canada) are a legal instrument introduced by King George VI, which came into effect on 1 October 1947 and continue to, along with parts of the Constitution Act, 1867, constitute the Office of the Governor General.  These letters served to expand the role and powers of the governor general in exercising the Royal Prerogative and allows the governor general to carry out an increased number of the Sovereign's duties in "exceptional circumstances".  While the letters patent allow the governor general to use most of the "powers and authorities" lawfully belonging to the Canadian sovereign, this permission can be revoked, altered, or amended by the sovereign at any time and these powers and authorities thus remain with the monarch and are carried out by the governor general on his or her behalf.

Hawaii Sesquicentennial half dollar: The Hawaii Sesquicentennial half dollar was struck in 1928 by the United States Bureau of the Mint in honor of the 150th anniversary of Captain James Cook's landing in Hawaii, the first European to reach there.  The coin depicts Captain Cook on the obverse and a Hawaiian chieftain on the reverse.  Only 10,000 were struck for the public, making it rare and valuable.

Supporting paragraphs: Sovereign (British coin) Edward VIII
Answer: 28 May 1972