Question: British politician, soldier and colonial administrator, John Pitt, served as an aide-de-camp to King of Great Britain and Ireland from when to when?

Context articles: Chatham Sound
John Pitt (soldier)
MacGregor baronets
Tory government, 1783–1801
Robert Prescott
Edward Randolph (colonial administrator)
Pigot baronets
George I of Great Britain
John Buchan, 2nd Baron Tweedsmuir
Douglas Robinson (athlete)

Chatham Sound is a sound on the North Coast of British Columbia, Canada, located between Dundas and Stephens Islands and the Tsimpsean Peninsula near Prince Rupert, It was named in 1794 by Captain George Vancouver for John Pitt, 2nd Earl of Chatham, whose brother William Pitt, was later to become Prime Minister of Great Britain.
 Chatham Strait, in the northern Alaska Panhandle, was named for their father William Pitt, 1st Earl of Chatham.
John Pitt (1698–1754) was a British politician, soldier and colonial administrator.
 Pitt was the youngest son of Governor Thomas "Diamond" Pitt who made a fortune while in India and returned to Britain to found a political dynasty.
 John attended Eton College, and went into the army.
 He rose to the rank of lieutenant colonel and served as an aide-de-camp to George I.
The Murray, later MacGregor of MacGregor Baronetcy, of Lanrick in the County of Perth, is a title in the Baronetage of Great Britain.
 It was created on 3 July 1795 for John Murray.
 He was a member of the Scottish MacGregor clan.
 This branch of the family had been forbidden to wear their own surname by King James VI, the only instance of this in British history.
 The ban was revoked in 1661 by King Charles II but restored during the reign of William and Mary.
 It was finally repealed in 1774.
 However, it was not until 1822 that the family obtained Royal licence to use the family surname.
 The second Baronet was a colonial administrator and served as Governor of Dominica, Antigua, Barbados and Trinidad.
 Sir Evan MacGregor, third son of the second Baronet, was Permanent Secretary to the Admiralty.
 The sixth Baronet was a Brigadier in the Scots Guards.
 The MacGregors of MacGregor are also the Chiefs of Clan Gregor.
Tory William Pitt the Younger led the government of the Kingdom of Great Britain from 1783 to 1801.
 In 1800, the Acts of Union between Great Britain and Ireland were accepted by their respective parliaments, creating the new United Kingdom of Great Britain and Ireland, which would be governed by the former Parliament of Great Britain, now the Parliament of the United Kingdom.
 Pitt governed this new state for the first month of its existence, until differences with King George III over Catholic Emancipation caused him to resign.
General Robert Prescott (Lancashire c. 1726 – 21 December 1815 Rose Green West Sussex) was a British soldier and colonial administrator.
 He enlisted in the British Army in 1745 and served during the Seven Years' War.
 He was at the siege of Louisburg and became an aide-de-camp to General Jeffrey Amherst in 1759 participating in the capture of Montreal.
Edward Randolph (1632 - April 1703) was an English colonial administrator, best known for his role in effecting significant changes in the structure of England's North American colonies in the later years of the 17th century.
 Called "evil genius of New England and her angel of death", his reports to the Lords of Trade (predecessors to the 18th century Board of Trade) convinced King Charles II to revoke the charter of the Massachusetts Bay Colony in 1684, and he was a leading figure in the unpopular Dominion of New England.
 Randolph served as secretary of the dominion.
 While in that position, he argued for tighter crown control over proprietary and charter colonies whose administrations lacked such oversight, and he was often given the difficult task of enforcing England's Navigation Acts in whichever colony he was posted to, often against significant local popular and political resistance.
 His actions were a significant contribution to the development of Great Britain's colonial administrative infrastructure, but he remained unpopular in the dominion.
 During the 1689 Boston revolt, which deposed Andros and overthrew the dominion, he was jailed.
The Pigot Baronetcy, of Patshull Hall in the County of Stafford, is a title in the Baronetage of Great Britain.
 It was created on 5 December 1764 for the politician and colonial administrator George Pigot, with remainder to his brothers General Robert Pigot and Admiral Hugh Pigot, and remains extant.
 On 19 January 1766 Pigot was further honoured when he was raised to the Peerage of Ireland as Baron Pigot, with normal remainder to the heirs male of his body.
 Lord Pigot was unmarried (although he left several natural children; see below) and on his death in 1777 the barony became extinct.
 He was succeeded in the baronetcy according to the special remainder by his brother, Robert, the second Baronet.
 He was a distinguished soldier.
George I (George Louis; German: "Georg Ludwig" ; 28 May 1660 – 11 June 1727) was King of Great Britain and Ireland from 1 August 1714 until his death, and ruler of the Duchy and Electorate of Brunswick-Lüneburg (Hanover) in the Holy Roman Empire from 1698.
John Norman Stuart Buchan, 2nd Baron Tweedsmuir CBE, CD, FRSE, FRSA (25 November 1911 – 20 June 1996), commonly called Johnnie Buchan, was a Scottish peer and the son of the novelist John Buchan, 1st Baron Tweedsmuir.
 He was a colonial administrator and naturalist, but also a true-life adventurer.
 He has been described as a "brilliant fisherman and naturalist, a gallant soldier and fine writer of English, an explorer, colonial administrator and man of business."
Douglas Robinson (12 August 1864 – 19 January 1937) was a member of the silver medal winning French cricket team at the 1900 Summer Olympics, the only time to date that cricket has featured in the Olympics.
 In the only match against Great Britain, he took two wickets in Great Britain's first innings, and was dismissed for a duck in both French innings.
 Born of Irish parents in Montserrat, he was the son of the colonial administrator William Cleaver Francis Robinson.