This person is the subject of ongoing research. We have started by researching their relationship to the enslavement of people.
His nephew, Andrew Todd (c.1754–1796), emigrated to North America to work in his uncle (Isaac Todd)’s fur trading firm. By his will, he released his enslaved person, Jack (‘Andrew Todd (fur trader)’, Wikipedia [online], <https://en.wikipedia.org/wiki/Andrew_Todd_(fur_trader)> accessed 5 August 2021).
National Gallery painting connections
Donor: presented in 1837: NG83.
History of Parliament Trust (ed.), The History of Parliament: British Political, Social & Local History, London 1964-, https://www.historyofparliamentonline.org/
Checked and not found — Item on publisher's website
R. H. Vetch and R. T. Stearn, 'Thornton, Sir William', in C. Matthew et al. (eds), Oxford Dictionary of National Biography, Oxford 1992-, https://doi.org/10.1093/ref:odnb/27366
Checked and found — Item on publisher's website