In a single voyage Dias and his crew cartographed 1 000 nautical miles of the African coast. A feat of unparalleled scientific relevance in the XV century. He should indeed be recognised as the most consequent sea captain of his generation.
A fascinating history, difficult to preserve, I understand, after the Lisbon earthquake of 1755. We are pretty certain, in modern South Africa that the storm which gave Dias difficulty around southern Africa occurred at present day Cape Town, which suffers regular storms of rain & heavy winds thanks to being near to the Southern Ocean. Hence, Dias gave the Cape Peninsula that initial name of Cape of Storms: a short-lived name, for the Cape of Good Hope is its very longstanding name.
He died in a shipwreck in 1500, when he was in the Pedro Álvares Cabral expedition to India, that discovered Brazil. Ironically he died at the Cape of Good Hope.
Its not Diego, its Diogo Cão. Portuguese name for the Spanish Diego. You`ve heard of the actor Diogo Morgado, who entered in the film "The Son of God"? Your History is so innovative that got his name wrong.