voyage toward the east, but the Lisbon pilots who understood the importance of this discovery in their quest for the India water route, changed the name into that of the Cape of Good Hope.
One year later, Pedro de Covilham, provided with letters of credit on the house of Medici, started upon a similar mission by land. He crossed the Mediterranean and after leaving Egypt, he travelled southward. He reached Aden, and from there, travelling through the waters of the Persian Gulf which few white men had seen since the days of Alexander the Great, eighteen centuries before, he visited Goa and Calicut on the coast of India where he got a great deal of news about the island of the Moon (Madagascar) which was supposed to lie halfway between Africa and India. Then he returned, paid a secret visit to Mecca and to Medina, crossed the Red Sea once more and in the year 1490 he discovered the realm of Prester John, who was no one less than the Black Negus (or King) of Abyssinia, whose ancestors had adopted Christianity in the fourth century, seven hundred years before the Christian missionaries had found their way to Scandinavia.
These many voyages had convinced the Portuguese geographers and cartographers that while the voyage to the Indies by an eastern sea-route was possible, it was by no means easy. Then there arose a great debate. Some people wanted to continue the explorations east of the Cape of Good Hope. Others said, "No, we must sail west across the Atlantic and then we shall reach Cathay."
Let us state right here that most intelligent people of that day were firmly convinced that the earth was not as flat as a pancake but was round. The Ptolemean system of the universe, invented and duly described by Claudius Ptolemy, the great Egyptian geographer, who had lived in the second century of our era, which had served the simple needs of the men of the Middle Ages, had long been discarded by the scientists of the Renaissance. They had accepted the doctrine of the Polish mathematician, Nicolaus Copernicus, whose studies had con-
