Latest / The History of Portugal: The Small Nation That Built a Global Empire — Fexingo History / The Tordesillas Line: How Spain and Portugal Split the World
Transcript
- Lucas: So we've talked about so many pieces of the Portuguese empire — the carreira, the cartaz, the battles in the Indian Ocean. But I think there's one instrument that made all of that possible, in a weird way, that we haven't really touched on yet. The Treaty of Tordesillas. Luna: Oh, the one where they drew a line down the map? Lucas: Exactly. But it wasn't just a line on a map — it was a legal and theological division of the entire unexplored world. Signed in 1494, six years after Dias rounded the Cape, two years after Columbus stumbled onto the Caribbean. The kings of Spain and Portugal, with the Pope's blessing, essentially said: everything east of this meridian is yours, Portugal; everything west is yours, Spain. Luna: How do you even decide where to draw that line? Lucas: That's the thing — they didn't really know. They had a few maps, a lot of guesswork, and a strong dose of papal authority. The line was set at 370 leagues west of the Cape Verde islands. But nobody agreed exactly where that fell. It was a line on a map that didn't quite exist, drawn by people who had only a vague idea of what lay on either side. Lucas: The backstory goes back to the 1450s, when the Portuguese were already exploring down the African coast. The Pope at the time, Nicholas V, issued a bull called Romanus Pontifex that basically gave Portugal a monopoly on trade and conquest south of Cape Bojador. Then in 1481, Sixtus IV confirmed that with Aeterni Regis, granting all lands south of the Canaries to Portugal. So the Portuguese felt they had a pretty solid claim to anything they found. Luna: So then Columbus shows up and messes it all up. Lucas: Right. Columbus, sailing for Spain, comes back in 1493 claiming islands in the western Atlantic. The Spanish king and queen, Ferdinand and Isabella, immediately want papal recognition. So Alexander VI — a Spaniard, conveniently — issues a series of bulls, the most famous being Inter Caetera, which grants Spain all lands west of a line drawn 100 leagues west of the Azores and Cape Verde. Portugal was not happy. Luna: I bet they weren't. Lucas: They protested, and the two kingdoms sat down in the small Castilian town of Tordesillas. After months of negotiation, they agreed to move the line 270 leagues further west — to 370 leagues from Cape Verde. That way, the Portuguese kept their route down Africa and across to India, and Spain got the western Atlantic. But here's the catch: at that time, nobody knew there was a whole continent in between. Lucas: And that's how Brazil ended up speaking Portuguese. When Pedro Álvares Cabral landed there in 1500, he claimed it for Portugal — and the Treaty of Tordesillas justified that, because the bulge of Brazil falls east of the line. Whether Cabral deliberately aimed for it or was blown off course, the treaty made his claim legal, at least in European terms. Luna: So the treaty literally shaped the map of South America. Lucas: It did. But it also created huge headaches. Because as the Portuguese pushed further east — reaching Malacca, the Moluccas, China, Japan — the Spanish started to wonder: are those spice islands actually on our side of the line? The Moluccas, the fabled Spice Islands, were the prize. So in 1529, they signed a second treaty, at Zaragoza, which set an antimeridian on the other side of the globe, essentially giving the Moluccas to Portugal in exchange for a large payment. Luna: So they literally sold the other half of the world. Lucas: In a way, yes. It was a pragmatic solution, but it shows how speculative the whole thing was. They were dividing a globe they had only partially explored, using longitude lines they couldn't accurately measure. The exact position of the Tordesillas line was disputed for centuries. Lucas: Now, a lot of people today find the whole idea arrogant — dividing the world without asking the people who lived there. And that's a fair critique. But it's also a fascinating window into how Europeans thought about the globe in the 1490s. They genuinely believed the Pope had the authority to grant new lands to Christian princes, and that discovery gave you a right to rule. It's a mindset that would have devastating consequences, but it also drove the entire Age of Discovery. Lucas: And here's a little detail I love: the treaty specifically said that the line should be drawn through the 'Atlantic Ocean' — but they didn't have a reliable way to measure longitude at sea. So in practice, the line was more of a political fiction than a navigational reality. That's why you get cartographers like Diogo Ribeiro, working for the Spanish Casa de Contratación, drawing increasingly detailed maps that tried to reconcile the treaty with actual discoveries — and often fudging the line to suit their own king's claims. Luna: So it was like a legal fiction that everyone agreed to pretend was real? Lucas: Exactly. And that fiction had enormous power. For one thing, it kept Spain and Portugal from going to war over the new discoveries — for a while, at least. It also set a precedent for how European powers would carve up the non-European world, right up through the Berlin Conference in 1885. The idea that a line on a map could determine sovereignty, even before you'd seen the land, that's a legacy that echoes down to today. Luna: You know, speaking of lines on a map that determine things — I was thinking, this show is kind of like that for us. I mean, we keep drawing our own little line through history, episode by episode, and it's amazing that you keep following it. Lucas: Ha, that's a nice way to put it. And you know, we're able to keep drawing that line, week after week, because of listeners who support the show. If you've been stepping into history with us, and you find these conversations worth your time, you can help keep them ad-free. It's as simple as buying me a coffee at buy me a coffee dot com slash fexingo. No pressure, just knowing that someone out there values this kind of deep dive keeps me going. Luna: Yeah, it really does make a difference for a small show like ours. Lucas: Alright, back to the line. So the treaty wasn't just about the Americas. The Portuguese used it to justify their claims in Africa and Asia too. When they reached India, they argued that their presence was sanctioned by the Pope and by their treaty with Spain. It gave their empire a legal patina, even though in practice it was enforced by cannon and the cartaz system. But the legal framework was important for diplomacy — it's why they could negotiate with other European powers, and why they were so resistant to the Dutch and English encroachments later on. Lucas: The Tordesillas line also had a strange afterlife. After Spain and Portugal were united under Philip II in 1580, the treaty became somewhat moot — you didn't need to divide the world if you were the same king. But it was revived after Portugal regained independence in 1640, and it remained a reference point in colonial disputes for centuries. Even Brazil's modern borders owe something to that imaginary meridian, as it was used in later negotiations to settle boundaries between Spanish and Portuguese territories in South America. Luna: So it's not just a medieval curiosity, it's like a living document. Lucas: Absolutely. And that's what makes it so compelling to me — the friction between the grand ambition of drawing a line around the world and the messy reality of actually exploring it. The Portuguese chronicler João de Barros, writing in the 1550s, defended the treaty as a wise and pious act, but even he acknowledged that the exact position of the line was unknown. He wrote, 'We do not know where it lies, but we trust in the Holy Father who set it.' Luna: That's a remarkable leap of faith. Lucas: It is. And it ties into a broader theme we've touched on in other episodes: the Portuguese were incredibly pragmatic navigators, but they also operated within a deeply religious worldview. They believed that discovery was a divine calling, that the spread of Christianity justified their expansion, and that the Pope's authority was real, even when it was inconvenient. Tordesillas is the perfect intersection of faith, politics, and geography. Lucas: There's also a nice irony in the fact that the treaty was signed in a town called Tordesillas, which today is known mostly for being a quiet provincial place. But in 1494, it was the center of the world — kings, bishops, and ambassadors gathered there to decide the fate of the globe. It's a reminder that history often happens in small, unassuming rooms. Luna: And then the line itself is invisible, but it shaped so much. Lucas: Yes. And I think that's the thing to remember: the Treaty of Tordesillas wasn't just a piece of paper. It was a declaration that the world could be known, measured, and owned. That's a profoundly modern idea, even though it was wrapped in medieval theology. And it set the stage for everything we've talked about in this series — the carreira, the cartaz, the battles, the missions. Without that line, the Portuguese empire might have looked very different. Lucas: So next time you look at a map of Brazil or think about why they speak Portuguese in Mozambique, remember that it all goes back to a line drawn in a small Castilian town over five hundred years ago. It's a line you can't see, but it's still with us.