Question: When did the father of Frederick IV of Denmark die?

Context articles: Christian Detlev Reventlow
Frederick IV of Denmark
Frederik Krag
Great Northern War
Louise of Mecklenburg-Güstrow
Frederick IV, Elector Palatine
Christian V of Denmark
Hendrick Krock
Princess Charlotte Amalie of Denmark
Christian VI of Denmark

Christian Detlev, Count von Reventlow (1671–1738) was a Danish military leader and diplomat.
 He was the son of Conrad, Count Reventlow, chancellor of Denmark and half-brother of Anne Sophie Reventlow, queen consort of Denmark and, initially, morganatic wife of Frederick IV of Denmark.
Frederick IV (11 October 1671 – 12 October 1730) was the king of Denmark and Norway from 1699 until his death.
 Frederick was the son of King Christian V of Denmark-Norway and his consort Charlotte Amalie of Hesse-Kassel.
Frederik Krag (6 March 1655 – 24 September 1728) was a Danish nobleman (Baron) and senior civil servant who served kings Frederick IV and Frederick V.
 He was Governor-General of Norway from 1713 until 1722.
 He is not fondly remembered in Norway due to his attempts to subordinate the farmers there in a similar level of service to that which was common in Denmark of the period.
The Great Northern War (1700–21) was a conflict in which a coalition led by the Tsardom of Russia successfully contested the supremacy of the Swedish Empire in Central, Northern, and Eastern Europe.
 The initial leaders of the anti-Swedish alliance were Peter I of Russia, Frederick IV of Denmark–Norway and Augustus II the Strong of Saxony-Poland.
 Frederick IV and Augustus II were defeated by Sweden, under Charles XII, and forced out of the alliance in 1700 and 1706 respectively, but rejoined it in 1709 after the defeat of Charles XII at the Battle of Poltava.
 George I of Great Britain and of Brunswick-Lüneburg (Hanover) joined the coalition in 1714 for Hanover and in 1717 for Britain, and Frederick William I of Brandenburg-Prussia joined it in 1715.
Louise of Mecklenburg-Güstrow (28 August 1667 – 15 March 1721) was Queen consort of Denmark and Norway as the first spouse of the King Frederick IV of Denmark.
Frederick IV, Elector Palatine of the Rhine (German: "Kurfürst Friedrich IV.
 von der Pfalz" ; 5 March 1574 – 19 September 1610), only surviving son of Louis VI, Elector Palatine and Elisabeth of Hesse, called "Frederick the Righteous" (German: "Friedrich Der Aufrichtige" ; French: "Frédéric IV le juste").
Christian V (15 April 1646 25 August 1699) was king of Denmark and Norway from 1670 until his death in 1699.
Hendrick Krock (21 July 1671 – 18 November 1738) was a Danish history painter who, from 1706, was the court painter of Frederick IV as well as his successor Christian VI.
 Along with Benoit Le Coffre set the tone for history painting in Denmark during the 18th century-1720s, having been influenced by the Italian baroque painting he experienced during his travels.
 He also played a role in the eventual establishment of an Art Academy in Denmark.
Charlotte Amalie of Denmark (6 October 1706 – 28 October 1782) was a Danish princess, daughter of King Frederick IV of Denmark and Louise of Mecklenburg-Güstrow.
Christian VI (30 November 1699 – 6 August 1746) was King of Denmark and Norway from 1730-46.
 The eldest surviving son of King Frederick IV and Louise of Mecklenburg-Güstrow, he is considered one of Denmark's more anonymous kings, but he was a skilled politician, best known for his authoritarian regime.
 He was the first king of the Oldenburg dynasty to refrain from entering in any war.
 He was married to Sophia Magdalene of Brandenburg-Kulmbach and was the father of Frederick V.
 His chosen motto was "deo et populo" (for God and the people).