3.1 million enslaved people trafficked to the British colonies

William Johnston appeared alongside Thomas [sic] Newton and Thomas Gordon (q.v.) among 13 co-owners of a slaving voyage from London by the Duchess of Portland to Cape Coast Castle and ‘Lucea/St Lucea’ in 1792.  The connections between the lead co-owner of the voyage William Hamilton (q.v.) and Thomas Gordon have reinforced the inference that the co-ownership was in the name of the firm of Newton, Gordon and Johnston, the Madeira wine merchants. William Johnston himself had died by 1791.