With the opening of the fifteenth century, Portugal was pressing forward for a share with the maritime states of Italy, Genoa, and Venice in the rich eastern traffic. In 1410 Prince Henry, “the Navigator,” had begun his systematic explorations. A younger son of the Portuguese king John the first, and a grandson of Edward the third of England, born at the close of the fourteenth century (in 1394), after gaining renown as a soldier, he turned to loftier aims and became one of the first astronomers, mathematicians, cartographers, and directors of maritime discoveries in his time. He was the first to conceive the idea of cutting a way out through the unexplored ocean. His superb genius gave the inspiration to marvellous results in the discovery of more than half the globe within the cycle of a century. At the age of twenty-four the hope was born in him of reaching India by the south point of Africa, and thereafter to this end his speculations and studies were ardently directed. The earliest expeditions sent out by him failed of results, and his theories were ridiculed by his fellow-nobles. At length, however, in 1419 and 1420, the Madeira Islands, Porto Santo and Madeira, were rediscovered by his navigators. A little more than a decade later, in 1433, they had rounded Cape Bojador. In 1435 the prince’s cup-bearer had passed beyond that cape. In 1443 another of his navigators had sailed beyond Cape Blanco. The next year Pope Martin the fifth, by a Papal Bull, declared Portugal in possession of all the lands her mariners had visited as far as the Indies. In 1445 the mouth of the Senegal and afterward Cape Verde were reached. Prince Henry died in 1460, but the work he had begun continued, after a temporary check, to be carried forward. In 1469 Portuguese trade was opened with the Gold Coast. In 1484 the mouth of the Congo was discovered. In 1486 Bartholomew Dias doubled the Cape of Good Hope. Meanwhile these wondrous advances of Portugal were stimulating other maritime nations to the quest for new passages to India. V QUEST FOR THE NORTHWEST PASSAGE Portugal now had practically a monopoly of the traffic with the Orient, and the finding of new paths to India by her maritime rivals was essential in the struggle for commercial supremacy. A passage by way of “Cathay” had the most powerful attractions.