Treaty of Zaragoza

Also known as: Tratado de Zaragoza — the Spanish designation · Capitulation of Zaragoza — the styling this wiki's Spanish East Indies entry carries · The Zaragoza anti-meridian — the line the treaty drew · The Moluccas purchase of 1529 — the transactional framing of the 350,000 ducats · Spain–Portugal treaty of April 22, 1529 — the date-and-parties form

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Definition

The Treaty of Zaragoza (Spanish Tratado de Zaragoza; styled the Capitulation of Zaragoza in this wiki’s Spanish East Indies entry) is the agreement signed at Zaragoza, Aragon, on April 22, 1529, between John III of Portugal and the Emperor Charles V — Charles I of Spain — that drew the anti-meridian of the Treaty of Tordesillas: the counterpart line on the opposite side of the globe, fixed at 297½ leagues (1,763 kilometres; 952 nautical miles) east of the Moluccas, about seventeen degrees east of the islands, near 135° east of Greenwich. (Wikipedia — Treaty of Zaragoza, Wikipedia (Spanish) — Tratado de Zaragoza) By its terms Portugal paid the emperor 350,000 gold ducats, and Spain renounced its claims to the Moluccas — the Spice Islands Magellan’s fleet had reached in 1521, the Loaísa expedition’s survivors still held from their fort at Tidore, and the junta of Badajoz-Elvas of 1524 had failed to divide. (Wikipedia — Loaísa expedition, Wikipedia — Treaty of Tordesillas)

The treaty did not modify the Tordesillas line itself, leaving the globe split unequally — roughly 191 degrees to Portugal and 169 to Spain, within the era’s four-degree margin of uncertainty — and it did not name the Philippines at all. (Wikipedia — Treaty of Zaragoza) Because the archipelago lay well west of the new line, the standard accounts read the instrument as an implicit relinquishment of any Spanish claim; yet Charles moved on the islands anyway with the Villalobos expedition of 1542 — which gave them the name Las Islas Filipinas — and Philip II’s settlement at Cebu in 1565 met little Portuguese opposition, the islands lacking the spices the purchase had been about. (Wikipedia (Spanish) — Tratado de Zaragoza, Wikipedia — Ruy López de Villalobos, Wikipedia — Miguel López de Legazpi) For the Philippines the treaty is therefore the legal silence before the founding: Spain sold the cloves and kept, by omission, the country this wiki’s Spanish East Indies and Manila galleon entries document as the Pacific’s Spanish base from 1565. (Wikipedia — Manila galleon)

Identities

Source Type	Identity
Wikipedia	Treaty of Zaragoza
Wikidata	Treaty of Zaragoza (Q1147471)
DBpedia	Treaty_of_Zaragoza
ProductOntology	N/A
Wiktionary	Zaragoza (English proper noun — the Aragonese city where the instrument was signed; there is no headword for the treaty)
Library of Congress Subject Headings (LCSH)	N/A
MeSH	N/A
NCBI Taxonomy	N/A
AGROVOC	N/A
Google Scholar	Treaty of Zaragoza 1529 antimeridian Tordesillas Moluccas 297.5 leagues 17 degrees 350000 gold ducats Charles V John III Villalobos 1542 Legazpi 1565 Philippines Philippines question
ConceptNet	N/A
OpenCyc	N/A

Also Known As

Tratado de Zaragoza — the Spanish designation
Capitulation of Zaragoza — the styling this wiki’s Spanish East Indies entry carries
The Zaragoza anti-meridian — the line the treaty drew
The Moluccas purchase of 1529 — the transactional framing of the 350,000 ducats
Spain–Portugal treaty of April 22, 1529 — the date-and-parties form

Examples and Analogies

A boundary drawn with a purchase order: where Tordesillas had split the world by papal-sanctioned line in 1494, Zaragoza priced the remainder — Portugal buying out Spain’s Pacific spice claims for 350,000 gold ducats, the anti-meridian set 297½ leagues east of the islands themselves so that the purchase would cover them whole. (Wikipedia — Treaty of Zaragoza)
A sale with an option to repurchase: the treaty carried a safeguard clause allowing the emperor to revoke the sale upon refunding the ducats — an option never exercised, because the money was consumed by the War of the League of Cognac against Francis I of France. (Wikipedia (Spanish) — Tratado de Zaragoza)
The silence that made the Philippines possible: the treaty’s silence on the archipelago — not named, priced, or assigned — became the legal room in which Villalobos sailed in 1542 and Legazpi settled in 1565, the galleon trade this wiki’s Manila galleon entry documents as the working answer to the treaty’s unstated question. (Wikipedia — Manila galleon)
Verified treaty data:
Signed: April 22, 1529, Zaragoza, Aragon; parties John III of Portugal and the Emperor Charles V (Charles I of Spain)
Negotiation record: the settlement followed the failed junta of Badajoz-Elvas of 1524, where the Spanish plenipotentiaries included Mercurino Gattinara, García de Loaysa (bishop of Osma), and García de Padilla (grand master of Calatrava), and Portugal’s António de Azevedo Coutinho, Diogo Lopes de Sequeira, and Lopo Homem served — the treaty accounts carry the names principally through that junta
The line: 297½ leagues (1,763 km; 952 nmi) east of the Moluccas, about 17° east of the islands, near 135°E; the Tordesillas line of 1494 itself left unmodified
The payment: 350,000 gold ducats from Portugal to the emperor, against Spain’s renunciation of Moluccan claims, navigation, and trade
The safeguard: revocation permitted if the ducats were refunded — never exercised; the funds went to the League of Cognac war
Philippines status: not explicitly mentioned; the islands lie west of the line, the accounts reading the instrument as implicit relinquishment — against which Spain sent Villalobos in 1542 and settled at Cebu in 1565 with little Portuguese opposition, the islands lacking spices
Consequences: the Casa de la Especiería at A Coruña (created 1522) disappeared; the Loaísa expedition’s Tidore survivors came home under Portuguese guard, the last twenty-four reaching Lisbon in 1536; the Manila–Acapulco route opened in 1565 on Urdaneta’s tornaviaje; Portugal’s later westward push in Brazil produced the Treaty of Madrid of January 13, 1750 (Wikipedia — Loaísa expedition, Wikipedia — Strait of Magellan)

Usage Scenarios

1. Teaching the Tordesillas System’s Pacific Half

The treaty is the closing instrument of the two-line world — Tordesillas 1494 west, Zaragoza 1529 east — and the classroom’s cleanest case of a boundary priced rather than fought out, with the four-degree uncertainty stated rather than hidden. (Wikipedia — Treaty of Tordesillas, Wikipedia — Treaty of Zaragoza)

2. Researching the Loaísa Expedition’s Endgame

The men at Tidore — the fort this wiki’s Loaísa expedition entry documents from 1527 — were the treaty’s unconsulted subjects: the parchment sold their colony, and their 1536 return under Portuguese guard closed the second circumnavigation. (Wikipedia — Loaísa expedition)

3. Studying the Philippines’ Pre-1565 Status

Legal historians work the treaty’s omission — the islands unnamed, implicitly west of the line, claimed anyway from 1542 — as the standing case in how silence in a boundary instrument becomes the room a later settlement occupies. (Wikipedia (Spanish) — Tratado de Zaragoza, Wikipedia — Ruy López de Villalobos)

4. Tracing the Legal Foundation of the Galleon Trade

The 1565 settlement at Cebu and the Manila galleon that followed rested on the treaty’s aftermath — Spain having taken the Pacific’s non-spice islands after selling the spice islands — the framing this wiki’s Manila galleon entry carries in its Zaragoza discussion. (Wikipedia — Manila galleon, Wikipedia — Miguel López de Legazpi)

5. Comparing Iberian Boundary Treaties

Set beside Tordesillas (1494), Utrecht’s derivatives, and the Treaty of Madrid (1750) that revised Portugal’s Brazil limits, Zaragoza shows the system’s arithmetic — and its expiration, as Dutch and English entry ended the Ibero-Pacific monopoly the treaty assumed. (Wikipedia — Treaty of Tordesillas, Wikipedia (Spanish) — Tratado de Zaragoza)

Strategies

Sell what you cannot hold: Charles’s calculation — 350,000 ducats in hand against a fort at Tidore Portugal could besiege indefinitely — converted a military stalemate into cash for the European war, the transaction the Tidore garrison learned of from afar. (Wikipedia — Treaty of Zaragoza, Wikipedia — Loaísa expedition)
Anchor the line to the prize: fixing the anti-meridian 297½ leagues east of the Moluccas rather than at a meridian of its own made the purchase self-defining — the islands inside whatever the longitude science of the day misstated. (Wikipedia (Spanish) — Tratado de Zaragoza)
Keep the refund clause: the safeguard clause preserved the emperor’s theoretical title while he spent the money — the treaty’s built-in hedge, exercised never. (Wikipedia (Spanish) — Tratado de Zaragoza)
Occupy the silence: Spain’s Philippine policy after 1529 proceeded by settlement rather than renegotiation — Villalobos in 1542, Legazpi in 1565 — letting possession answer the question the treaty had not asked. (Wikipedia — Miguel López de Legazpi)
For researchers: carry the figures in their documented form — April 22, 1529; 297½ leagues; 17 degrees east of the Moluccas; 350,000 gold ducats — the values this wiki’s Loaísa expedition, Strait of Magellan, and Manila galleon entries already anchor. (Wikipedia — Loaísa expedition, Wikipedia — Strait of Magellan)

Security and Safety Measures

Fleet stand-down as the treaty’s guarantee: with the sale signed, the naval contest of 1525–1529 in the Moluccas ended in orders rather than battle — the anti-meridian functioning as a mutual stand-down line for Iberian arms in the Pacific. (Wikipedia — Loaísa expedition)
The safeguard clause as insurance: the refund provision gave each side a lawful exit from the bargain, containing the dispute the line had drawn — the security value of a priced boundary over a fought one. (Wikipedia (Spanish) — Tratado de Zaragoza)
The excluded third parties: the treaty’s monopoly meant nothing to France, England, and the Dutch, whose Pacific entry later forced the mare clausum-versus-mare-liberum argument — the boundary that secured two crowns against each other and neither against the rest. (Wikipedia (Spanish) — Tratado de Zaragoza)
For researchers: the signatory-level record is thin — the accounts document the parties and the junta negotiators rather than the instrument’s undersigners; cite the parties and terms, and treat the plenipotentiary names as the junta’s record. (Wikipedia — Treaty of Zaragoza)

Historical Context

The treaty closed a decade Spain had opened westward against its own treaty system. Tordesillas in 1494 had given Portugal everything east of 370 leagues west of the Cape Verdes; Magellan’s crossing of 1520–1521 — the voyage this wiki’s Magellan expedition entry documents, through the strait its Strait of Magellan entry carries — put Spanish ships in the hemisphere Tordesillas had assigned to Lisbon, and the Spice Islands exactly on the fault line; the junta of Badajoz-Elvas of 1524 broke up without drawing the anti-meridian. (Wikipedia — Magellan expedition, Wikipedia — Strait of Magellan) Charles answered with the Loaísa expedition of 1525, whose flagship’s survivors held Tidore against the Portuguese from 1527, and with Saavedra’s relief from Mexico in 1528 — a stalemate of forts and monsoons that the treasury could not outlast. (Wikipedia — Treaty of Tordesillas, Wikipedia — Loaísa expedition, Wikipedia — Strait of Magellan)

The sale of April 22, 1529 ended the stalemate on paper before it ended in fact: the Tidore garrison came home under Portuguese guard by 1536, the A Coruña spice house closed, and the emperor’s money went to the war against France. What remained was the treaty’s margin of silence — an unnamed archipelago west of the line — through which Villalobos’s 1542 expedition gave the islands Philip’s name and Legazpi’s 1565 settlement at Cebu gave them Spain’s flag, the settlement made durable by Urdaneta’s tornaviaje the same year and expressed in the Manila galleon that ran to Acapulco for two and a half centuries. When Portugal finally revised the Iberian map, it did so in the Atlantic system’s other hemisphere — the Treaty of Madrid of 1750, redrawing Brazil — leaving Zaragoza’s Pacific line to history as the boundary that priced the Moluccas and, by omission, conceded the Philippines. (Wikipedia (Spanish) — Tratado de Zaragoza, Wikipedia — Miguel López de Legazpi, Wikipedia — Manila galleon)

Challenges and Controversies

The Philippines Question

Whether the treaty excluded the Philippines is the instrument’s standing dispute of interpretation: the islands are not named, and the standard accounts read them as implicitly relinquished — west of the anti-meridian — while Spain’s own conduct from 1542 treated the silence as room to settle. The corpus framing this entry follows — the galleon entries’ “Spain sold the Moluccas; the Philippines became the Pacific’s Spanish base” — states the outcome; the treaty itself states nothing. (Wikipedia — Treaty of Zaragoza, Wikipedia — Manila galleon)

A Colony Sold from Under Its Garrison

The men holding Tidore — sent to plant Spain in the Moluccas, maintained for years by Mexico’s relief voyages — learned their enterprise had been priced at 350,000 ducats, the betrayal-versus-realpolitik judgment this wiki’s Loaísa expedition entry frames. The safeguard clause was their theoretical protection; the European war consumed it. (Wikipedia — Loaísa expedition, Wikipedia (Spanish) — Tratado de Zaragoza)

The Line’s Arithmetic

The anti-meridian carried the era’s longitude problem whole: the 17-degree figure, the 297½-league distance, and the roughly 135°E position rest on a science several degrees wrong, and the unequal hemispheres the two treaties produced — about 191° to Portugal against 169° to Spain — were known to be approximate even to their drafters. (Wikipedia — Treaty of Zaragoza)

The Unexercised Refund

The clause permitting revocation upon repayment was never used, and Spain’s 1565 settlement proceeded without refunding the ducats — the point Portuguese protest could have stood on and, lacking appetite for a Pacific war over spiceless islands, did not. The treaty thus ended as a sale honored in its payment and breached in its spirit, the assessment the later literature argues. (Wikipedia (Spanish) — Tratado de Zaragoza, Wikipedia — Miguel López de Legazpi)