Much scholarship on the British transatlantic slave trade has focused on its peak period in the late eighteenth century and its abolition in the early nineteenth; or on the Royal African Company (RAC), which in 1698 lost the monopoly it had previously enjoyed over the trade. During the early eighteenth-century transition between these two better-studied periods, Humphry Morice was by far the most prolific of the British slave traders. He bears the guilt for trafficking over 25,000 enslaved...