Bartolomeu Dias was a Portuguese explorer renowned for his pioneering maritime expedition around the southern tip of Africa, known as the Cape of Good Hope, which he successfully navigated in 1488. This achievement was significant as it opened up a sea route to Asia for European traders and marked a pivotal moment in the Age of Exploration. Dias’s journey demonstrated the feasibility of sailing around Africa to reach India and its lucrative spice markets, laying the groundwork for future explorations by other explorers, such as Vasco da Gama.
The other options do not accurately reflect Dias's contributions or identity. The Spanish conquistadors were typically involved in the subjugation and colonization of the Americas, which doesn't apply to Dias. While he contributed to the understanding of Africa’s coastline, he did not circumnavigate Africa; that feat would be accomplished later. Dias did not establish a trade route to India directly, as his voyages were primarily exploratory, and the establishment of an actual trade route was realized later by explorers who followed in his footsteps. Lastly, the Pueblo Revolt concerns Native American resistance in the Americas, which is unrelated to Dias's activities in Africa.