John Jackson RA (31 May 1778 – 1 June 1831) was an English painter who specialised in portraits.
Jackson was born in Lastingham, Yorkshire, and started his career as an apprentice tailor to his father, who opposed the artistic ambitions of his son. However, he enjoyed the support of Henry Phipps, 1st Earl of Mulgrave (1755–1831), who recommended him to the Earl of Carlisle; as well as that of Sir George Beaumont, 7th Baronet, who offered him residence at his own home and £50 per year.
As a result, Jackson was able to attend the Royal Academy Schools, where he befriended David Wilkie and B. R. Haydon. At Castle Howard, residence of the Earl of Carlisle, he could study and copy
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