CAM, DIOGO, a Portuguese discoverer, of noble birth, belonging to the latter half of the 15th century, is famous for having carried on, under Alphonso V., the discoveries in Western Africa commenced by Don Henry. He sailed round capes Goncalvez and Catharina ; and having obtained great influence with the king of Congo, opened up that country for the introduction of Christianity. On his first voyage (1484) he was accompanied by Martin Behem, the astronomer and cosmographer. Subsequently Cain penetrated as far as 22° S. lat.