George Hamilton-Gordon, 5th Earl of Aberdeen
Lord Haddo was born at Bentley Priory in Hertfordshire, the eldest son of the 4th Earl of Aberdeen and was educated at Harrow School and Trinity College, Cambridge. On 5 November 1840, he married Mary Baillie (a sister of the future 10th Earl of Haddington) at Taymouth Castle and they had six children: George (1841–1870) who died unmarried, James Henry (1845–1868, who committed suicide, which was passed off as a rifle accident), in his rooms in Cambridge), John Campbell (1847–1934), Mary (1844–1914, married the 8th Lord Polwarth), Harriet (1849–1942, married William Lindsay) and Katherine Eliza (1852–1931, married the 6th Lord Balfour of Burleigh).
His uncle, William Gordon, had retired as Member of Parliament for Aberdeenshire in 1854 and Haddo put himself forward as his successor. However, Haddo had contracted what was probably tuberculosis and he went to Egypt to spend a few months in a warm climate. Despite being absent from Scotland and not having canvassed the constituency, Haddo won the election and returned to take his seat in the House of Commons, in good health, a year later. He left the Commons after inheriting his father's title in 1860 and made a second trip to Egypt. Aberdeen had previously converted to evangelicalism and it was in Egypt that he campaigned for the Coptics to convert to his own faith. Aberdeen later returned to Scotland and died at his home, Haddo House in 1864. He was buried at Methlick and was succeeded by his eldest son, George. His last words were (when asked how he felt) "Perfectly comfortable". Hamilton-Gordon donated a large collection of antiquities that his father had collected to the British Museum in 1861.
- "Gordon, George John James (Lord Haddo) (GRDN834GJ)". A Cambridge Alumni Database. University of Cambridge.
- John Doran "Haddo: The House with Outstretched Arms, Leopard magazine, July 2002
- British Museum Collection 
- Hansard 1803–2005: contributions in Parliament by George Hamilton-Gordon, 5th Earl of Aberdeen
- Portraits of Mary (Baillie), Countess of Aberdeen at the National Portrait Gallery, London
|Parliament of the United Kingdom|
|Member of Parliament for Aberdeenshire
|Peerage of Scotland|
|Earl of Aberdeen