Tordesillas Line

The Treaty of Tordesillas, ; pt, Tratado de Tordesilhas . signed in Tordesillas, Spain on 7 June 1494, and authenticated in Setúbal, Portugal, divided the newly discovered lands outside Europe between the Portuguese Empire and the Spanish Empire ( Crown of Castile), along a meridian 370 leagues west of the Cape Verde islands, off the west coast of Africa. That line of demarcation was about halfway between the Cape Verde islands (already Portuguese) and the islands entered by Christopher Columbus on his first voyage (claimed for Castile and León), named in the treaty as Cipangu and Antillia (Cuba and Hispaniola).

The lands to the east would belong to Portugal and the lands to the west to Castile, modifying an earlier division proposed by Pope Alexander VI. The treaty was signed by Spain, , and by Portugal, . The other side of the world was divided a few decades later by the Treaty of Zaragoza, signed on , which specified the antimeridian to the line of demarcation specified in the Treaty of Tordesillas. 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.

Despite considerable lack of information regarding the geography of the New World, Portugal and Spain largely respected the treaty. The other European powers, however, did not sign the treaty and generally ignored it, particularly those that became Protestant after the Reformation. Similarly, the indigenous peoples of the Americas did not acknowledge the treaty, and as the legal foundation for the discovery doctrine, it has been a source of ongoing tension regarding land ownership into modern times.

The treaty was included by UNESCO in 2007 in its Memory of the World Programme.

Signing and enforcement

The Treaty of Tordesillas was intended to solve the dispute that arose following the return of Christopher Columbus and his crew, who had sailed under the Crown of Castile. 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, in fact, 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. After reading the letter the Catholic Monarchs knew they did not have any military power in the Atlantic to match the Portuguese, so they pursued a diplomatic way out. On 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 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, protecting 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, oncluding that it was adiplomatic 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 countered his bulls. However, it was subsequently sanctioned by his successor Pope Julius II by means of the bull ''Ea quae pro bono pacis'' of 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 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".

The line was not strictly enforced—the Spanish did not resist the Portuguese expansion of Brazil across the meridian. However, Spain attempted to stop the Portuguese advance in Asia, by claiming the meridian line ran around the world, dividing the whole world in half rather than just the Atlantic. Portugal pushed back, seeking another papal pronouncement that limited the line of demarcation to the Atlantic. This was given by Pope Leo X, who was friendly toward Portugal and its discoveries, in 1514 in the bull ''Praecelsae devotionis''.

The divided possessions sanctioned by the treaty continued, even when Spain and Portugal were united under a single king between 1580 and 1640, until the treaty was superseded by the 1750 Treaty of Madrid.

Emerging Protestant maritime powers, particularly England and The Netherlands, and other third parties such as Catholic France, did not recognize the division of the world between only two Catholic nations brokered by the pope.

Tordesillas meridian

The Treaty of Tordesillas only specified the line of demarcation in leagues from the Cape Verde Islands. It did not specify the line in degrees, nor did it identify the specific island or the specific length of its league. Instead, the treaty stated that these matters were to be settled by a joint voyage, which never occurred. The number of degrees can be determined via a ratio of marine leagues to degrees applied to the earth regardless of its assumed size, or via a specific marine league applied to the true size of the earth, called "our sphere" by historian Henry Harrisse.
* The earliest Aragonese opinion was provided by Jaime Ferrer in 1495 at the request of the Aragonese king and Castilian queen to those monarchs. He stated that the demarcation line was 18° west of the most central island of the Cape Verde Islands, which is Fogo according to Harrisse, having a longitude of 24°25′ west of Greenwich, hence Ferrer placed the line at 42°25′W on his sphere, which was 21.1% larger than our sphere. Ferrer also stated that his league contained 32 Olympic stades, or according to Harrisse, thus Ferrer's line was west of Fogo at 47°37′W on our sphere.

* The earliest surviving Portuguese opinion is on the Cantino planisphere of 1502. Because its demarcation line was midway between Cape Saint Roque (northeast cape of South America) and the mouth of the Amazon River (its estuary is marked ''Todo este mar he de agua doçe—''"All of this sea is fresh water"—and its river is marked ''Rio grande'', "great river"), Harrisse concluded that the line was at 42°30′W on our sphere. Harrisse believed the large estuary just west of the line on the Cantino map was that of the Rio Maranhão (this estuary is now the Baía de São Marcos and the river is now the Mearim), whose flow is so weak that its gulf does ''not'' contain fresh water.
* In 1518 another Castilian opinion was provided by Martin Fernandez de Enciso. Harrisse concluded that Enciso placed his line at 47°24′W on his sphere (7.7% smaller than ours), but at 45°38′W on our sphere using Enciso's numerical data. Enciso also described the coastal features near which the line passed in a very confused manner. Harrisse concluded from this description that Enciso's line could also be near the mouth of the Amazon between 49°W and 50°W.
* In 1524 the Castilian pilots (ships' captains) Thomas Duran, Sebastian Cabot (son of John Cabot), and Juan Vespuccius (nephew of Amerigo Vespucci) gave their opinion to the Badajoz Junta, whose failure to resolve the dispute led to the Treaty of Saragossa. They specified that the line was 22° plus nearly west of the center of Santo Antão (the westernmost Cape Verde island), which Harrisse concluded was 47°17′W on their sphere (3.1% smaller than ours) and 46°36′W on our sphere.
* In 1524 the Portuguese presented a globe to the Badajoz Junta on which the line was marked 21°30′ west of Santo Antão (22°6′36″ on our sphere).

Antimeridian: Moluccas and Treaty of Zaragoza

Initially, the line of demarcation did not encircle the earth. Instead, Spain and Portugal could conquer any new lands they were the first to discover, Spain to the west and Portugal to the east, even if they passed each other on the other side of the globe. But Portugal's discovery of the highly valued Moluccas in 1512 caused Spain to argue in 1518 that the Treaty of Tordesillas divided the earth into two equal hemispheres. After the surviving ships of Magellan's fleet visited the Moluccas in 1521, Spain claimed that those islands were within its western hemisphere. In the early 16th century, the Treaty between Spain and Portugal, concluded at Vitoria; 19 February 1524 and called for the Badajoz Junta to meet in 1524, at which the two countries tried to reach an agreement on the anti-meridian but failed. They finally agreed in a treaty signed at Zaragoza that Spain would relinquish its claims to the Moluccas upon the payment of 350,000 ducats of gold by Portugal to Spain. To prevent Spain from encroaching upon Portugal's Moluccas, the anti-meridian was to be leagues or 17° to the east of the Moluccas, passing through the islands of Las Velas and Santo Thome. This distance is slightly smaller than the 300 leagues determined by Magellan as the westward distance from los Ladrones to the Philippine island of Samar, which is just west of due north of the Moluccas.

The Moluccas are a group of islands west of New Guinea. However, unlike the large modern Indonesian archipelago of the Maluku Islands, to 16th-century Europeans the Moluccas were a small chain of islands, the only place on earth where cloves grew, just west of the large north Malukan island of Halmahera (called Gilolo at the time). Cloves were so prized by Europeans for their medicinal uses that they were worth their weight in gold. 16th- and 17th-century maps and descriptions indicate that the main islands were Ternate, Tidore, Moti, Makian and Bacan, although the last was often ignored even though it was by far the largest island. The principal island was Ternate at the chain's northern end (0°47′N, only in diameter) on whose southwest coast the Portuguese built a stone fort (Forte de São João Baptista de Ternate) during 1522–23, which could only be repaired, not modified, according to the Treaty of Saragossa. This north–south chain occupies two degrees of latitude bisected by the equator at about 127°24′E, with Ternate, Tidore, Moti, and Makian north of the equator and Bacan south of it.

Although the treaty's Santo Thome island has not been identified, its "Islas de las Velas" (Islands of the Sails) appear in a 1585 Spanish history of China, on the 1594 world map of Petrus Plancius, on an anonymous map of the Moluccas in the 1598 London edition of Linschoten, and on the 1607 world map of Petro Kærio, identified as a north–south chain of islands in the northwest Pacific, which were also called the "Islas de los Ladrones" (Islands of the Thieves) during that period. Their name was changed by Spain in 1667 to "Islas de las Marianas" ( Mariana Islands), which include Guam at their southern end. Guam's longitude of 144°45′E is east of the Moluccas' longitude of 127°24′E by 17°21′, which is remarkably close by 16th-century standards to the treaty's 17° east. This longitude passes through the eastern end of the main north Japanese island of Hokkaidō and through the eastern end of New Guinea, which is where Frédéric Durand placed the demarcation line. Moriarty and Keistman placed the demarcation line at 147°E by measuring 16.4° east from the western end of New Guinea (or 17° east of 130°E). Despite the treaty's clear statement that the demarcation line passes 17° east of