John Hamilton was a Scottish MP in the British Parliament

Parliament of Great Britain

The Parliament of Great Britain was formed in 1707 following the ratification of the Acts of Union by both the Parliament of England and Parliament of Scotland...

. He was the younger son of John Dalrymple, 2nd Earl of Stair

John Dalrymple, 2nd Earl of Stair

Field Marshal John Dalrymple, 2nd Earl of Stair KT PC was a Scottish soldier and diplomat.-Military career:Despite being born in Edinburgh, Scotland, Dalrymple spent his early life mostly in the Netherlands and he studied at Leiden University...

 and changed his name to Hamilton in 1736 when he inherited the estate of Bargeny on the death of the 4th Lord Bargeny.

He represented Wigtown Burghs

Wigtown (UK Parliament constituency)

Wigtown Burghs, also known as Wigton Burghs,. was a constituency of the House of Commons of the Parliament of Great Britain from 1708 to 1800 and of the House of Commons of the Parliament of the United Kingdom from 1801 to 1885. It was represented by one Member of Parliament .The first election in...

 1754-1761 and 1762-1768. He was also MP for Wigtownshire

Wigtownshire (UK Parliament constituency)

Wigtownshire, was a constituency of the House of Commons of the Parliament of Great Britain from 1708 to 1801 and of the Parliament of the United Kingdom from 1801 to 1918. It was represented by one Member of Parliament....

 1761-February 1762.

Hamilton was a friend of Frederick, Prince of Wales

Frederick, Prince of Wales

Frederick, Prince of Wales was a member of the House of Hanover and therefore of the Hanoverian and later British Royal Family, the eldest son of George II and father of George III, as well as the great-grandfather of Queen Victoria...

and supported the Grenvilles in politics. He was an energetic man, who enthusiastically promoted negotiatied arrangements in 1754 and 1762 which led to the rival Stewart family supporting him as MP for Wigtown Burghs in exchange for Dalrymple support in the Wigtownshire constituency.