Why is the Cape of Good Hope so called?

In 1486, Bartholomew Diaz, a Portuguese nobleman set sail from Lisbon, determined to follow the African coast further than anyone had before. After he had passed the mouth of the Congo (now Zaire) River, a fierce storm sent his ship reeling out to sea. When the gales had blown themselves out, he tacked back to the coast and found to his surprise that it now lay to the west. The storm had blown his ship right around the Cape. On his return to Portugal, Diaz told King John II that he had named the great promontory the ‘Cape of Storms’. But the king, realizing this discovery might open a route to greater wealth, suggested that it be renamed the Cape of Good Hope.