But he was still very much a son of the Middle Ages and spent a great deal of time and wasted a lot of money upon a search for the mysterious "Presser John," the mythical Christian Priest who was said to be the Emperor of a vast empire "situated somewhere in the east." The story of this strange potentate had first been told in Europe in the middle of the twelfth century. For three hundred years people had tried to find "Presser John" and his descendants Henry took part in the search. Thirty years after his death, the riddle was solved. In the year 1486 Bartholomew Diaz, trying to find the land of Prester John by sea, had reached the southernmost point of Africa. At first he called it the Storm Cape, on account of the strong winds which had prevented him from continuing his 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."