In that year Antonio Goncalvez, master of the robes to Prince Henry, was sent out with a vessel to load it with skins of "sea-wolves," a number of them having been seen, during a former voyage, at the mouth of a river about a hundred and fifty miles beyond Cape Bojador.

Goncalvez resolved to signalize his voyage by a feat that should gratify his master more than the capture of sea-wolves; and he accordingly planned and executed successfully an expedition for seizing some Azeneghi Moors, in order, as he told his companions, to take home "some of the language of that country." Tristam, another of Prince Henry's captains, afterwards falling in with Goncalvez, a further capture of Moors was made, and Goncalvez returned to Portugal with the spoil.

This voyage seems to have prompted the application which Prince Henry made, in the same year, to Pope Martin the Fifth, praying that his holiness would grant to the Portuguese crown all that should be conquered, from Cape Bojador to the Indies, together with plenary indulgence for those who should die while engaged in such conquests.

The pope granted these requests; though afterwards, as we shall see, the Spanish discoveries of Columbus and his successors rendered it necessary that the terms of the grant should be modified.

"And now," says a Portuguese historian, "with this apostolic grace, with the breath of royal favour, and already with the applause of the people, the prince pursued his purpose with more courage, and with greater outlay." COMMENCEMENT OF THE SLAVE TRADE.
One proof of this popular approval was furnished by the formation of a company at Lagos, in 1444, who received permission from the prince to undertake discovery along the coast of Africa, paying him a certain portion of any gains which they might make.