Turning his ships east now to sail home, Dias caught sight of the Cape of Good Hope for the first time. It was a historic moment: this definitive proof of the end of Africa demolished forever a tenet of Ptolemy’s geography. According to Barros, Dias and his companions named it the Stormy Cape, which King João changed to the Cape of Good Hope, “ because it promised the discovery of India, so long desired and sought for over so many years.” Dias left the Cape with a good stern wind.
— from “Conquerors: How Portugal Forged the First Global Empire” by Roger Crowley http://www.amazon.com/dp/B00UEL0HNK/ref=pe_385040_118058080_TE_M1T1DP