Latest / The History of Portugal: The Small Nation That Built a Global Empire — Fexingo History / The Forgotten Treaty: Portugal's Tordesillas Line and Its Global Legacy
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- Luna: So, we've talked about Portugal's empire all over the world, but I realized we never really covered the treaty that literally drew lines on the map. Lucas: You're right—the Treaty of Tordesillas in 1494. It's one of those documents that sounds almost absurd today: the pope dividing the entire non-Christian world between two kingdoms. But it shaped everything that followed, from Brazil's Portuguese language to the Spanish conquest of the Americas. Luna: How did the pope even have that authority? Lucas: Well, in the 15th century, the papacy was seen as the ultimate arbiter of Christian disputes, and both Portugal and Spain were deeply Catholic kingdoms. The issue started with earlier papal bulls—especially 'Inter Caetera' from Pope Alexander VI in 1493, which gave Spain the lands Columbus had discovered, provided they weren't already held by a Christian prince. Portugal was furious, because they'd been exploring the African coast for decades with papal approval. Lucas: King João II of Portugal was a shrewd negotiator. He threatened to send ships to claim Columbus's discoveries, and he convinced the Spanish monarchs, Ferdinand and Isabella, to come to the negotiating table. The result was the Treaty of Tordesillas, signed on June 7, 1494, in the Spanish town of Tordesillas. Luna: And the line? It's that famous vertical line through the Atlantic. Lucas: Exactly. The treaty drew a meridian 370 leagues west of the Cape Verde islands, which Portugal controlled. Everything east of that line went to Portugal, everything west to Spain. But at the time, no one knew exactly where the line fell, because longitude was nearly impossible to measure. They used a league—about 5.5 kilometers—but that was just a rough estimate. Lucas: The Portuguese pushed the line further west than the original papal bull. And that turned out to be crucial, because when Pedro Álvares Cabral landed in Brazil in 1500, it fell within the Portuguese side. That's why Brazil speaks Portuguese today, not Spanish. Without that westward shift, Brazil might have been Spanish. Luna: So Portugal essentially got an entire continent because of good negotiating. Lucas: Partly, yes. João II was a master diplomat. But the treaty also had a huge blind spot: the other side of the world. When Magellan and Elcano circumnavigated the globe, the Spanish claimed the Moluccas—the Spice Islands—were on their side of the line. Portugal said no. The dispute dragged on until the Treaty of Zaragoza in 1529, where Spain essentially sold its claim to Portugal for 350,000 ducats. Lucas: But the bigger picture is that Tordesillas was only respected by Portugal and Spain. Other European powers—England, France, the Dutch Republic—never accepted it. Francis I of France famously said, 'I should like to see the clause in Adam's will that excludes me from a share of the world.' So by the 17th century, the treaty was effectively dead, though it lingered in law until the 18th century. Luna: It's fascinating that a piece of paper drawn up in a small Spanish town could have such global consequences. Lucas: Absolutely. And it's worth remembering that the treaty didn't just divide land—it divided peoples. It gave Portugal and Spain a legal framework to claim territories they'd never set foot on, displacing millions of indigenous people. It's a reminder that empires aren't just built on ships and guns, but on words and ink. Lucas: Before we go further, I've been meaning to mention—this show exists because of a small group of listeners who chip in each month through buy me a coffee dot com slash fexingo. No ads, no sponsors, just people who love history and want to keep these conversations going. If you've been enjoying these deep dives, that's where you can help. Luna: Yeah, it really does make a difference. Every little bit helps us keep the research going and the episodes ad-free. Lucas: So back to Tordesillas—one detail I love is that the treaty was written in Spanish and Portuguese, and both versions survive. It's a fascinating document to read, with all the legal language of the time. And it's still cited in modern disputes, like the border between Brazil and its neighbors. Luna: Wait, really? The treaty is still used today? Lucas: In a way, yes. The treaty established the principle of 'uti possidetis, ita possideatis'—you own what you hold. That principle was used in the 19th century by newly independent Latin American countries to define borders. So Tordesillas had a long afterlife, even after Portugal and Spain were no longer the dominant powers. Lucas: There's also a famous story about the line being 'adjusted' in secret. Some historians argue that João II knew about Brazil before Cabral's voyage, because Portuguese explorers had already reached it and kept it quiet to include it in the Portuguese sphere. It's a tantalizing theory, but we don't have solid proof. Luna: So it's possible that the treaty was a cover for knowledge they already had. Lucas: Exactly. João II was a king who thought several moves ahead. He died in 1495, just a year after the treaty, but his legacy shaped Portugal's empire for centuries. And Tordesillas remained the official dividing line until the Iberian Union, when Spain and Portugal were ruled by the same king—and then after 1640, it was revived in theory, but by then other powers had carved out their own empires. Luna: It's amazing how a single treaty could be so influential and yet so fragile. Lucas: That's the story of empires, isn't it? Grand designs on paper, messy realities on the ground. The Treaty of Tordesillas is a perfect example of how people tried to impose order on a world they barely understood—and how that order, however flawed, had real, lasting consequences.