Who were the first Europeans to round the Cape of Good Hope and enter into the Indian ocean?

The first Europeans to successfully round the Cape of Good Hope and enter the Indian ocean were the Portuguese explorer Bartolomeu Dias in 1488. His expedition marked a significant milestone in the Age of Exploration, as it opened the sea route to India and the East. Dias's voyage paved the way for subsequent explorers, particularly Vasco da Gama, who later reached India by sea.