This is the earliest record we possess of the appearance of an English ship in the waters of Spanish America. Others, however, soon followed. In 1530 William Hawkins, father of the famous John Hawkins, ventured in "a tall and goodly ship ... called the 'Polo of Plymouth,'" down to the coast of Guinea, trafficked with the natives for gold-dust and ivory, and then crossed the ocean to Brazil, "where he behaved himself so wisely with those savage people" that one of the kings of the country took ship with him to England and was presented to Henry VIII. at Whitehall.[44] The real occasion, however, for the appearance of foreign ships in Spanish-American waters was the new occupation of carrying negroes from the African coast to the Spanish colonies to be sold as slaves. The rapid depopulation of the Indies, and the really serious concern of the Spanish crown for the preservation of the indigenes, had compelled the Spanish government to permit the introduction of negro slaves from an early period. At first restricted to Christian slaves carried from Spain, after 1510 licences to take over a certain number, subject of course to governmental imposts, were given to private individuals; and in August 1518, owing to the incessant clamour of the colonists for more negroes, Laurent de Gouvenot, Governor of Bresa and one of the foreign favourites of Charles V., obtained the first regular contract to carry 4000 slaves directly from Africa to the West Indies.[45] With slight modifications the contract system became permanent, and with it, as a natural consequence, came contraband trade. Cargoes of negroes were frequently "run" from Africa by Spaniards and Portuguese, and as early as 1506 an order was issued to expel all contraband slaves from Hispaniola.[46] The supply never equalled the demand, however, and this explains why John Hawkins found it so profitable to carry ship-loads of blacks across from the Guinea coast, and why Spanish colonists could not resist the temptation to buy them, notwithstanding the stringent laws against trading with foreigners.