So far from adopting any policy of this nature or making any claim to a special sovereignty in the surrounding seas, Elizabeth steadily opposed all claims which other nations put forward to _mare clausum_. Long before Grotius, she was the champion of the free sea, although it must be admitted that the action of the English Queen was no more based on considerations of the general good of mankind than were the efforts of the Dutch publicist: both had in view the interests of their native land. Elizabeth’s motive was to secure liberty of trade and fishery for her subjects, which was threatened by the pretensions of Spain and Portugal on the one hand and by Denmark on the other. The Portuguese pretension was of long standing. When that nation in the latter half of the fifteenth century had pushed her way down the west coast of Africa and ultimately round the Cape of Good Hope to the East Indies, she obtained from the Pope various bulls securing her in her possessions, and granting sovereign authority to the crown of Portugal in all the lands it might discover in the Atlantic from Cape Bojador to the Indies. By an inhuman doctrine established during the Crusades, Christian princes were supposed to have the right to invade, ravage, and acquire the territories of infidel nations on the plea of extending the sway of the Christian Church; and the Pope, from his supreme authority over all temporal things, disposed of these heathen lands to such princes as might bring them under the dominion of the Church and propagate the true faith among the inhabitants. Immediately on the return of Columbus from his first voyage in 1493, the Spanish monarchs accordingly obtained a bull from Pope Alexander VI. confirming them in the newly-discovered regions; and in order to prevent disputes with Portugal as to the extent of their respective claims, another bull was issued, on 4th May 1493, containing the famous line of demarcation between their territories. This was an ideal straight line drawn from the North Pole to the South Pole, passing 100 leagues to the west of the Azores and Cape Verde Islands. All islands or lands discovered to the west of this line by the Spaniards, and which had not been in the possession of any Christian Power before the preceding Christmas, were to belong to the Spanish crown; and all territory discovered to the east of it was to belong to Portugal. The Pope, moreover, granted a monopoly of commerce within those immense regions to the respective crowns, so that other nations could not trade thither without license from the Spanish or Portuguese sovereigns.[191] Spaniards even were not allowed to go to the New World either to trade or form establishments without royal license and authority. Disputes arose between Spain and Portugal as to the equity of the Pope’s line of demarcation, and by the Treaty of Tordesillas, 7th June 1494, they agreed that the inter-polar line should pass 370 leagues to the west of Cape Verde Islands.[192]