Latest / The History of Portugal: The Small Nation That Built a Global Empire — Fexingo History / The Treaty of Tordesillas: How Spain and Portugal Split the World
Transcript
- Lucas: So, we've talked a lot about Portugal's expansion down the African coast and into the Indian Ocean. But there's a moment that fundamentally shaped the entire Age of Discovery, and it happened not on a ship, but at a negotiating table in a small Spanish town. I'm talking about the Treaty of Tordesillas, signed in 1494. Luna: That's the one that split the world between Portugal and Spain, right? I've always wondered how that actually worked. Lucas: Exactly. To understand it, we have to go back to 1493. Columbus had just returned from his first voyage, claiming islands in the Caribbean for Spain. Portugal had been exploring the African coast for decades, and they had papal bulls from the 1450s that seemed to give them a monopoly on trade and discovery south of Cape Bojador. But now Spain had a foothold in the west, and both kingdoms were worried about encroachment. Luna: So they called in a referee? Lucas: Essentially. The referee was Pope Alexander VI, a Spaniard—Rodrigo Borgia—who had just become pope. The Spanish monarchs Ferdinand and Isabella, who were very devout and also politically savvy, asked him to issue a series of papal bulls that would legitimize their claims. The first one, Inter Caetera, in May 1493, gave Spain all lands discovered or to be discovered west of a line drawn 100 leagues west of the Azores and Cape Verde islands. That was incredibly generous to Spain. Luna: I bet Portugal wasn't happy about that. Lucas: Not at all. King João II of Portugal was furious. He saw this as undermining his country's hard-won gains. He had sponsored years of exploration, and now Spain was claiming the entire Atlantic. But João II was a shrewd diplomat. He didn't just complain—he began preparing a fleet to seize the disputed lands. That worried the Spanish, who wanted to avoid war. So they agreed to negotiate directly. Lucas: The negotiations took place in the town of Tordesillas, in Castile. The Portuguese delegation pushed for the line to be moved much farther west—370 leagues west of the Cape Verde islands. That may seem like a technical detail, but it had enormous consequences. At the time, no one knew exactly where that line would fall in practice. But it was far enough west that it would later give Portugal a claim to a massive chunk of South America—what became Brazil. Luna: So Brazil is Portuguese because of this treaty? Lucas: Exactly. When Pedro Álvares Cabral officially claimed Brazil for Portugal in 1500, it fell east of the Tordesillas line, so Portugal had a legal basis for it. Although, there's debate about whether the Portuguese already knew about Brazil before Cabral—some historians think they did and kept it secret until the treaty was signed. But officially, the treaty gave Portugal the eastern bulge of South America. Luna: That's a pretty good deal for Portugal. But what about Asia? The treaty also covered the other side of the world, right? Lucas: That's the tricky part. The treaty only drew a line in the Atlantic. It said that everything west of the line belonged to Spain, and everything east to Portugal. But the world is round, so theoretically, the line continued on the other side of the globe. The problem was that no one knew where that antipodal line would fall. The Moluccas—the Spice Islands—became a point of contention because both countries claimed them. That led to the Treaty of Zaragoza in 1529, which drew another line in the Pacific. Luna: So the treaty wasn't really a final solution. Lucas: No, it was a starting point. And it was based on a flawed understanding of geography. The 370-league measurement was just a number; no one had accurately measured longitude. The actual line was impossible to locate precisely with the instruments of the time. So in practice, the treaty was more of a political agreement than a functional boundary. But it did serve to reduce conflict between the two Iberian powers for a while. Lucas: It's also worth noting that the treaty was essentially a bilateral agreement between Portugal and Spain. Other European powers, like England and France, didn't recognize it at all. They saw it as a arrogant attempt by two countries to claim the whole world. And as they built their own empires, they simply ignored it. Luna: The treaty feels like a snapshot of a particular mindset—that the world could be divided and owned by a few Christian kings. Lucas: Exactly. It reflected the worldview of the time: that the pope had authority over non-Christian lands, and that exploration was tied to crusading and conversion. But it also shows how pragmatic and self-interested the monarchs were. They used the pope's authority when it suited them, but they were perfectly willing to negotiate around it when it didn't. Luna: What happened to the treaty in the long run? Did it last? Lucas: It was superseded by events. The union of Portugal and Spain under Philip II from 1580 to 1640 made the boundary temporarily irrelevant. After Portugal regained independence, the treaty was still referenced, but it became less important as other European powers ignored it. The final blow came with the rise of international law and the concept of free seas. But its legacy is still visible today: Brazil speaks Portuguese, and a huge portion of South America is Portuguese-speaking, while the rest is Spanish. So in a way, the Treaty of Tordesillas shaped the linguistic map of an entire continent. Luna: It's incredible that a piece of paper from 1494 still echoes today. Lucas: It really is. And it's a reminder that history isn't just about battles and discoveries—it's also about negotiations and treaties that carve up the world in ways that last centuries. The Treaty of Tordesillas was one of the most audacious diplomatic acts of the age: two nations, with limited knowledge of the globe, agreeing to split the unknown. That took a certain kind of nerve. Luna: And a lot of faith in the pope. Lucas: Exactly. But also faith in their own ambitions. And that combination—religious authority, royal power, and a willingness to draw lines on a blank map—defined the early modern era. It's a fascinating window into how Europeans thought about the world at the dawn of global empire.