The promoter of these expeditions was Prince Henry of Portugal, third son of John I. and Philippa, daughter of John Gaunt, though in justice to that amiable and learned prince, it must be borne in mind that the capture and sale of negroes was merely incidental to explorations the unary purpose of which was purely scientific.
"Bartholomew de Las Casas; his life, apostolate, and writings"
Francis Augustus MacNutt