🇵🇹 Diogo Cao

Diogo Cao was born around 1452, according to tradition in Vila Real in the northern Portuguese province of Tras-os-Montes. As with most navigators of his generation, the details of his early life are lost. He emerges into the historical record in the early 1480s as an experienced mariner in the service of King John II, the energetic monarch who had made the exploration of the African coast a central goal of the Portuguese crown.

John II's strategy was methodical. He wanted to push steadily down the coast of Africa, mapping it, claiming it, and searching for the southern tip that, if it existed, would open the way to India. To mark Portuguese sovereignty, his captains carried padroes, large stone pillars carved with the royal arms and an inscription, to be set up at the limits of each voyage. Cao was entrusted with carrying this program farther than it had yet gone.

On his first voyage, beginning around 1482, Cao sailed down the West African coast and made his great discovery: the mouth of the Congo River, which he reached in August 1482. He set up a padrao at the river mouth, at a place still called Shark Point, and made contact with the Kingdom of Kongo, a large, organized African state in the interior. This first contact would have lasting consequences, leading to a long and complex relationship, diplomatic, religious and ultimately exploitative, between Portugal and Kongo. Cao sent envoys upriver and, when they did not quickly return, took several Kongolese aboard as hostages, or guests, to bring back to Portugal.

Continuing south, Cao pushed down the coast of present-day Angola and erected a second pillar at Cape Santa Maria. He then returned to Lisbon in 1484, bringing the Kongolese visitors with him. King John II was delighted. He ennobled Cao, granted him an annuity, and gave him the right to add two pillars to his coat of arms in memory of the padroes he had planted, a striking honor that shows how much the crown valued what he had achieved.

Cao set out again on a second voyage in 1485. He returned the Kongolese visitors, who had learned Portuguese and would serve as interpreters, and sailed still farther south. He explored the coast of Namibia and erected a pillar at Cape Cross, around 21 degrees 50 minutes south, the farthest point reached by any European to that date. The inscriptions on the surviving pillars from Cape Santa Maria and Cape Cross, dated 1482 and 1485, can still be read today.

What happened next is uncertain. Diogo Cao seems to have died during or at the end of this second voyage, around 1486, most likely somewhere on the African coast. The exact circumstances are unknown; he simply disappears from the record. One inscription on a later map cryptically suggests he died near a place called Serra Parda.

Cao's voyages were a crucial bridge in the chain of Portuguese discovery. He extended the explored coastline by an enormous distance, well over a thousand miles beyond where his predecessors had stopped, and he brought the Portuguese to the threshold of the Cape. It was the very next major expedition, that of Bartolomeu Dias in 1487 and 1488, that finally rounded the southern tip of Africa, building directly on the ground Cao had won.

Today the four stone pillars that Diogo Cao planted have all been located, two of them still bearing legible inscriptions more than five centuries later, silent witnesses to his voyages. He is one of the essential figures of the Age of Discovery's African phase, the navigator who first revealed the great river at the center of the continent and carried the Portuguese flag to the doorstep of the route to India.