It was not until 1471 that the navigators unconsciously crossed the Equator, "into a new heaven and a new earth." They saw stars unknown in the Northern Hemisphere, and the Northern Pole star sank nearly out of sight. Another thirteen years and Diego Cam, a knight of the King's household, found the mouth of the Congo and erected a great Portuguese pillar on the famous spot. It was in the year 1484 that Diego Cam was ordered to go "as far to the south as he could." He crossed the Equator, which for past years had been the limit of knowledge, and, continuing southwards he reached the mouth of the mighty river Congo, now known as the second of all the African rivers for size. The explorer ascended the river, falling in with peacefully inclined natives. But they could not make themselves understood, so Cam took back four of them to Portugal, where they learned enough Portuguese to talk a little. They were much struck with Portugal and the kind treatment they received from the King, who sent them back to their country laden with presents for their black King at home. So with Diego Cam they all sailed back to the Congo River. They were received by the King in royal state. Seated on a throne of ivory raised on a lofty wooden platform, he could be seen from all sides, his "black and glittering skin" shining out above a piece of damask given to him to wear by the Portuguese explorer. From his shoulder hung a dressed horse's tail, a symbol of royalty; on his head was a cap of palm leaves. It was here in this Congo district that the first negro was baptized in the presence of some twenty-five thousand heathen comrades. The ceremony was performed by Portuguese priests, and the negro King ordered all idols to be destroyed throughout his dominions. Here, too, a little Christian church was built, and the King and Queen became such earnest Christians that they sent their children to Portugal to be taught. [Illustration: NEGRO BOYS, FROM CABOT'S MAP, 1544.] But even the discoveries of Diego Cam pale before the great achievement of Bartholomew Diaz, who was now to accomplish the great task which Prince Henry the Navigator had yearned to see fulfilled--the rounding of the Cape of Storms.