Among those who meditated on this geographical mystery was a young sea captain of Genoa, who had studied in the University of Pavia, but spent his early life upon the waves,--intelligent, enterprising, visionary, yet practical, with boundless ambition, not to conquer kingdoms, but to discover new realms. Born probably in 1446, in the year 1470 he married the daughter of an Italian navigator living in Lisbon; and, inheriting with her some valuable Portuguese charts and maritime journals, he settled in Lisbon and took up chart-making as a means of livelihood. Being thus trained in both the art and the science of navigation, his active mind seized upon the most interesting theme of the day. His studies and experience convinced him that the Cipango of Marco Polo could be reached by sailing directly west. He knew that the earth was round, and he inferred from the plants and carved wood and even human bodies that had occasionally floated from the West, that there must be unknown islands on the western coasts of the Atlantic, and that this ocean, never yet crossed, was the common boundary of both Europe and Asia; in short, that the Cipango could be reached by sailing west. And he believed the thing to be practicable, for the magnetic needle had been discovered, or brought from the East by Polo, which always pointed to the North Star, so that mariners could sail in the darkest nights; and also another instrument had been made, essentially the modern quadrant, by which latitude could be measured. He supposed that after sailing west, about eight hundred leagues, by the aid of compass and quadrant, and such charts as he had collected and collated, he should find the land of gold and spices by which he would become rich and famous.