The Treaty of Tordesillas, signed in Tordesillas, Spain, on 7 June 1494, and ratified in Setúbal, Portugal, divided the newly discovered lands outside Europe between the Kingdom of Portugal and the Crown of Castile, along a meridian 370 leagues (c. 2,100 km or 1,300 mi) west of the Cape Verde islands, off the west coast of Africa. That line of demarcation was about halfway between Cape Verde (already Portuguese) and the islands visited by Christopher Columbus on his first voyage (claimed for Castile and León), thought then to be Cipangu and Antillia, but in fact Cuba and Hispaniola; the treaty itself does not mention Cipangu or Antillia. The lands to the east would belong to Portugal and the lands to the west to Castile, modifying an earlier bull by Pope Alexander VI. The treaty was signed on 7 June 1494, then ratified by Spain on 2 July 1494, by Portugal on 5 September 1494, and by Pope Julius II on 24 January 1506. The other side of the world was divided a few decades later by the Treaty of Zaragoza, signed on 22 April 1529, which specified the antimeridian to the line of demarcation specified in the Treaty of Tordesillas. Portugal and Spain largely respected the treaties, while the Indigenous peoples of the Americas did not acknowledge them. The Treaty of Tordesillas was added by UNESCO to its Memory of the World international register in 2007. Originals of both treaties are kept at the General Archive of the Indies in Spain and at the Torre do Tombo National Archive in Portugal.
Signing and enforcement
The Treaty of Tordesillas was intended to solve the dispute that arose following the return in 1493 of Christopher Columbus and his crew, who had sailed under the Crown of Castile, from their first voyage. On his way back to Spain, he first stopped at Lisbon, where he requested another meeting with King John II to prove to him that there were more islands to the southwest of the Canary Islands. After learning of the Castilian-sponsored voyage, the Portuguese king sent a threatening letter to the Catholic Monarchs, King Ferdinand and Queen Isabella, stating that by the Treaty of Alcáçovas signed in 1479 and by the 1481 papal bull Aeterni regis that granted all lands south of the Canary Islands to Portugal, all of the lands discovered by Columbus belonged to Portugal. The Portuguese king also stated that he was already making arrangements for a fleet (an armada led by Francisco de Almeida) to depart shortly and take possession of the new lands. The Spanish rulers replied that Spain owned the islands discovered by Columbus and warned King John II not to permit anyone from Portugal to go there. Finally, the rulers invited Portugal to send ambassadors to begin diplomatic negotiations aimed at settling the rights of each nation in the Atlantic. On 4 May 1493, Pope Alexander VI (Rodrigo Borgia), an Aragonese from Valencia by birth, decreed in the bull Inter caetera that all lands west of a pole-to-pole line 100 leagues west of any of the islands of the Azores or the Cape Verde Islands should belong to Castile, although territory under Christian rule as of Christmas 1492 would remain untouched. The bull did not mention Portugal or its lands, so Portugal could not claim newly discovered lands even if they were east of the line. Another bull, Dudum siquidem, entitled Extension of the Apostolic Grant and Donation of the Indies and dated 25 September 1493, gave all mainlands and islands, "at one time or even still belonging to India" to Spain, even if east of the line. The Portuguese King John II was not pleased with that arrangement, feeling that it gave him far too little land—it prevented him from possessing India, his near-term goal. By 1493, Portuguese explorers had reached the southern tip of Africa, the Cape of Good Hope. The Portuguese were unlikely to go to war over the islands encountered by Columbus, but the explicit mention of India was a major issue. As the Pope had not made changes, the Portuguese king opened direct negotiations with the Catholic Monarchs to move the line to the west and allow him to claim newly discovered lands east of the line. In the bargain, John accepted Inter caetera as the starting point of discussion with Ferdinand and Isabella but had the boundary line moved 270 leagues west ('leagues' being undefined), in order to protect the Portuguese route down the coast of Africa and giving the Portuguese rights to lands that now constitute the eastern quarter of Brazil. As one scholar assessed the results, "both sides must have known that so vague a boundary could not be accurately fixed, and each thought that the other was deceived", concluding that it was a "diplomatic triumph for Portugal, confirming to the Portuguese not only the true route to India, but most of the South Atlantic".
The treaty was negotiated without consulting Pope Alexander VI and effectively superseded his bulls. However, it was subsequently sanctioned by his successor Pope Julius II by means of the bull Ea quae pro bono pacis of 24 January 1506 and therefore some sources call the resulting line the "Papal Line of Demarcation". Very little of the newly divided area had actually been seen by Europeans, as it was only divided via the treaty. Castile gained lands including most of the Americas, which in 1494 had little proven wealth. The easternmost part of current Brazil was granted to Portugal when in 1500 Pedro Álvares Cabral landed there while he was en route to India. Some historians contend that the Portuguese already knew of the South American bulge that makes up most of Brazil before this time, so his landing in Brazil was not an accident. One scholar points to Cabral's landing on the Brazilian coast 12 degrees farther south than the expected Cape São Roque, such that "the likelihood of making such a landfall as a result of freak weather or a navigational error was remote; and it is highly probable that Cabral had been instructed to investigate a coast whose existence was not merely suspected, but already known".
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