This trade was known as the Indian trade, and was carried on by overland caravans up through Asia and Northern Africa to the Mediterranean coasts. The goods brought into Europe by this means--gold, pearls, spices, rare woods--naturally set Europe to thinking that the lands producing them must be the most favored part of the world, and "the Indies" stood for wealth of all kinds. No one knew precisely where "the Indies" lay; no one knew about the Indian Ocean or the shape of Southern Africa; "the Indies" was simply an indefinite term for the rich and mysterious regions from which the caravans came. The old maps of the fifteenth century show three different countries of this name--Far India, beyond the Ganges River; Middle India, between the Ganges and the Indus; and Lesser India, including both sides of the Red Sea. On the African side of the Red Sea was located the legendary kingdom of a great monarch known as Prester John. _Prester_ is a shortening of Presbyter, for this John was a Christian priest as well as a king. Ever since the twelfth century there had been stories circulated through Europe about the enormously wealthy monarch who ruled over a vast number of Christians "in the Indies." At first Prester John's domain was supposed to be in Asia; later the legends shifted it over to Africa, Abyssinia probably; and it was with this division of "India" that the Portuguese Prince Henry hoped to establish a trade; not, at first, by rounding Africa and sailing up its east coast to Abyssinia, but by merely cruising down the coast of Western Africa till Abyssinia's Atlantic shores were reached; for so vague was the geography of that far-away day that Abyssinia was supposed to stretch from Ethiopia to the Atlantic. "If," reasoned Prince Henry, "my sailors can feel their way down Africa till they come to Prester John's territory, not only could our nation secure the rich trade which now goes to the Moors, but we could form a treaty with the African Christians and ask them to come to Europe and help us should the Moors ever again advance against us." This plan was approved by Pope Nicholas V., who sanctioned Prince Henry's enterprise in the hope of "bringing the people of India, who are reputed to honor Christ, to the aid of European Christians against Saracens and other enemies." This projected exploration of the African coast by "Henry the Navigator" was the whole foundation for the _mistaken statements that Christopher Columbus was trying to find "a sea route to India_." Prince Henry was trying to find a sea route to an African India which he supposed lay about where Guinea lies; and as for Christopher, he never undertook to find either this African India, nor the true Asiatic India; _he only promised the Spanish sovereigns that he would find "lands in the west_."