3.1 million enslaved people trafficked to the British colonies

‘John Mason’ appears as the co-owner with Kender Mason (q.v.) of a slaving voyage from London by the Henry to the Gold Coast and Dominica in 1786, captained by John Mason. The TASTDB includes the suffix (Sr), which might refer to either man but we have concluded it refers to Kender Mason, and that John Mason was owner-captain, and possibly the same man as John Mason of Rotherhithe (q.v.).