It will be noted that this license did not say anything about the southern ocean. Already troops of Spanish cavaliers were pouring into the seaports, eager to make discoveries by the road of Columbus, and Spain would regard as unfriendly any attempt to send English ships in that direction. Whatever could be got from the Spanish territories Henry would try another way of getting. The year before he had arranged to have Prince Arthur, the heir to his throne, marry the fourth daughter of the King of Aragon, Catherine, then a little Princess of eleven. Prince Arthur died while still a boy, and Catherine became the first wife of Henry, afterward Henry VIII. With a Spanish Princess as queen of England, there might be an alliance between the two countries. That would be better than quarreling with Spain over discoveries which were at best uncertain. If Cabot really found anything valuable in the northern seas the move might turn out to be a good one. It would make England a more powerful member of the Spanish alliance, without taking anything which Spain appeared to value. In May, 1497, properly furnished with provisions and a few such things as might show what England had to barter, the little _Matthew_ sailed from Bristol under the command of John Cabot with his nineteen-year-old son Sebastian and a crew of eighteen--nearly all Englishmen, used to the North Atlantic. The King's permission was for five ships, but the wise Cabot had heard something of the hardships of the first expeditions to Hispaniola, and preferred to keep within his means, and sail with men whom he could trust. But on this voyage they found locked harbors not closed by the order of any King but by natural causes,--harbors without inhabitants or means of supporting life, and so far north as to be blocked by ice for half the year. They sailed seven hundred leagues west and came at last to a rocky wooded coast. Now in all the books of travel in Asia, mention had been made of an immense territory ruled by the Grand Cham of Tartary, whose hordes had nearly overrun Eastern Europe in times not so very long ago. The adventures of Marco Polo the Venetian, in a great book sent to Cabot by his wife's father, had been the fairy-tale of Sebastian and his brothers from the time they were old enough to understand a story. In this book it was written how Marco Polo and his companions passed through utterly uninhabited wilds in the Great Khan's empire, and afterward came to a region of barbarians, who robbed and killed travelers. These fierce people lived on the fruits and game of the forest, cultivating no fields; they dressed in the skins of wild animals and used salt for money. Could this be the place? If so it behooved the little party of explorers to be careful. As yet, nobody dreamed that any mainland discovered by sailing westward from northern Europe could be anything but Asia.