John Hamilton 1st Marquess of Abercorn1

Male, #58226, (Jul 1756 - 27 Jan 1818)
Father*Captain John Hamilton (Royal Navy Officer)1 (2 Mar 1714 - 18 Dec 1755)
Mother*Harriet Craggs1 (s 1720 - )
Death of Father18 Dec 1755 His father Captain John Hamilton (Royal Navy Officer) died on 18 Dec 1755.1 
Birth*Jul 1756 He was born in Jul 1756.2 
Marriage*20 Jun 1779 He married Catherine Copley on 20 Jun 1779 at age 22.2 
Birth of Son7 Oct 1786 His son James Hamilton Viscount Hamilton was born on 7 Oct 1786 at Petersham Lodge, co. Surrey, England.3 
Death of Son27 May 1814 His son James Hamilton Viscount Hamilton died on 27 May 1814 at Mayfair, London, England.3 
Death*27 Jan 1818 He died at Bentley Priory, Stanmore, London, England, on 27 Jan 1818 at age 61.2 
Biography* John James Hamilton, 1st Marquess of Abercorn KG PC (July 1756 – January 27, 1818) was the son of Captain Hon. John Hamilton and grandson of James Hamilton, 7th Earl of Abercorn.

He was educated at Harrow and Pembroke College, Cambridge. There he became the friend of William Pitt the Younger, a connection that would serve him well in later years.

He married, firstly, Catherine Copley, daughter of Sir Joseph Copley, 1st Baronet, on 20 June 1779. They had five children:
     1. Lady Harriet Margaret Hamilton (1780–1803), died unmarried.
     2. Lady Maria Hamilton (1782–1814), died unmarried.
     3. Lady Catherine Elizabeth Hamilton (1784–1812), married George Hamilton-Gordon, 4th Earl of Aberdeen and had issue.
     4. James Hamilton, Viscount Hamilton (1786–1814), married Harriet Douglas, granddaughter of James Douglas, 14th Earl of Morton and had issue.
     5. Lord Claud Hamilton (1787–1808), died unmarried.

He was a Tory MP for two boroughs in Cornwall from 1783 to 1789, when he succeeded to the Earldom. He was a supporter of his friend Pitt's first ministry, and a friend of William Pitt the Younger. He was created 1st Marquess of Abercorn on 15 October 1790, doubtless due to his political connections.

He married, secondly, his first cousin, Lady Cecil Hamilton, daughter of Reverend The Hon. George Hamilton, on 4 March 1792, but they were divorced in 1799 by an Act of Parliament. They had one child:
     1. The Lady Cecil Frances Hamilton (July 19, 1795 – July 7, 1860), married William Howard, 4th Earl of Wicklow and had issue.

He was sworn of the Privy Council of Ireland on 7 February 1794. Most of the Abercorn lands were in Ireland, and the Marquess made great efforts to build a voting bloc in the Irish Parliament from County Donegal and County Tyrone, although with relatively little success.

He married, thirdly, Lady Anne Jane Gore, daughter of Arthur Gore, 2nd Earl of Arran, on 3 April 1800.

He was invested as a Knight of the Garter on 17 January 1805.

Lord Abercorn died in 1818, aged 61 at Bentley Priory, Stanmore and his titles passed to his grandson, James Hamilton.2 


Catherine Copley (say 1759 - )
Marriage*20 Jun 1779 He married Catherine Copley on 20 Jun 1779 at age 22.2 
ChartsDiana, Princess of Wales: Culpeper Ancestral Chart
The Culpepers of Hollingbourne, co. Kent, England (Possibly extinct): Descendant Chart
Last Edited9 Mar 2008


  1. John Hamilton (Royal Navy officer). (2007, December 3). In Wikipedia, The Free Encyclopedia. Retrieved 15:06, March 9, 2008, from
  2. John Hamilton, 1st Marquess of Abercorn. (2008, March 6). In Wikipedia, The Free Encyclopedia. Retrieved 15:17, March 9, 2008, from
  3. James Hamilton, Viscount Hamilton. (2007, July 19). In Wikipedia, The Free Encyclopedia. Retrieved 15:29, March 9, 2008, from