He entered the British Army with the rank of Ensign in 1759, and progressed through the ranks until promoted Colonel in 1782. He resigned his commission in 1789 because of bad health, and died at Seine-et-Marne, Île-de-France, France on 20th March 1791.
Paul, Sir James Balfour (ed.), The Scots Peerage: founded on Wood's edition of Sir Robert Douglas's Peerage of Scotland, vol. 4; London: David Douglas, 1907. Digitised by the Internet Archive. p. 392
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It may be possible to confirm family relationships with Spencer by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: