From 1470 to 1484 we find him in Portugal, the country most interested and engaged then in ocean-going and discovery. Here he must have known Martin Behem, author of the famous globe, finished in 1492, whereon Asia is exhibited as reaching far into the same hemisphere with Europe. Prince Henry of Portugal earnestly patronized all schemes for exploration and discovery, and the daughter, Philippa, of one of his captains, Perestrello, Columbus married. With her he lived at Porto Santo in the Madeiras, where he became familiar with Correo, her sister's husband, also a distinguished navigator. The islanders fully believed in the existence of lands in the western Atlantic. West winds had brought to them strange woods curiously carved, huge cane-brakes like those of India described by Ptolemy, peculiarly fashioned canoes, and corpses with skin of a hue unknown to Europe or Africa. [Illustration: Prince Henry of Portugal--"The Navigator." From an old print.] [1475-1484] Reflecting on these things, studying Perestrello's and Correo's charts and accounts of their voyages, corresponding with Toscanelli and other savans, himself an adept in drawing maps and sea-charts, for a time his occupation in Lisbon, cruising here and there, once far northward to Iceland, and talking with navigators from every Atlantic port, Columbus became acquainted with the best geographical science of his time. This had convinced him that India could be reached by sailing westward. The theoretical possibility of so doing was of course admitted by all who held the earth to be a sphere, but most regarded it practically impossible, in the then condition of navigation, to sail the necessary distance. Columbus considered the earth far smaller than was usually thought, a belief which we find hinted at so early as 1447, upon the famous mappe-Monde of the Pitti Palace in Florence, whereon Europe appears projected far round to the northwest. Columbus seems to have viewed this extension as a sort of yoke joining India to Scandinavia by the north. He judged that Asia, or at least Cipango, stretched two-thirds of the way to Europe, India being twice as near westward as eastward. Thirty or forty days he deemed sufficient for making it. Toscanelli and Behem as well as he held this belief; he dared boldly to act upon it. [Illustration: Queen Isabella of Spain.] But to do so required resources. There are indications that Columbus at some time, perhaps more than once, urged his scheme upon Genoa and Venice. If so it was in vain. Nor can we tell whether such an attempt, if made, was earlier or later than his plea before the court of Portugal, for this cannot be dated. The latter was probably in 1484. King John II. was impressed, and referred Columbus's scheme to a council of his wisest advisers, who denounced it as visionary. Hence in 1485 or 1486 Columbus proceeded to Spain to lay his project before Ferdinand and Isabella.