In the history of the fifteenth century few names rank
higher than that of Prince Henry, commonly called the Navigator, because of his
services to the cause of exploration. The son of a Portuguese king, he devoted
himself during more than forty years to organizing scientific discovery. Under
his direction better maps were made, the astrolabe was improved, the compass
was placed on vessels, and seamen were instructed in all the nautical learning
of the time. The problem which Prince Henry studied and which Portuguese
sailors finally solved was the possibility of a maritime route around Africa to
the Indies.
EXPLORATION OF THE AFRICAN COAST
The expeditions sent out by Prince Henry began by
rediscovering the Madeira and Azores Islands, first visited by Europeans in the
fourteenth century. Then the Portuguese turned southward along the unchartered
African coast. In 1445 A.D. they got as far as Cape Verde, or "Green
Cape," so called because of its luxuriant vegetation. The discovery was
important, for it disposed of the idea that the Sahara desert extended
indefinitely to the south. Sierra Leone, which the Carthaginian Hanno had
probably visited, was reached in 1462 A.D., two years after Prince Henry's
death. Soon Portuguese sailors found the great bend of the African coast formed
by the gulf of Guinea. In 1471 A.D. they crossed the equator, without the
scorching that some had feared. In 1482 A.D. they were at the mouth of the
Congo. Six years later Bartholomew Diaz rounded the southern extremity of
Africa. The story goes that he named it the Cape of Storms, and that the king
of Portugal, recognizing its importance as a stage on the route to the East,
rechristened it the Cape of Good Hope.