Treaty of San Ildefonso (1777)
E86044
The Treaty of San Ildefonso (1777) was an agreement between Spain and Portugal that redefined their colonial boundaries, particularly in South America and Africa, and confirmed Spanish control over territories that would become Equatorial Guinea.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Treaty of San Ildefonso (1777) canonical | 2 |
| First Treaty of San Ildefonso | 1 |
| First Treaty of San Ildefonso (1777) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T700716 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Treaty of San Ildefonso (1777) Context triple: [Spanish colonization of Equatorial Guinea, treatyBasis, Treaty of San Ildefonso (1777)]
-
A.
Treaty of San Ildefonso (1796)
The Treaty of San Ildefonso (1796) was an alliance agreement in which Spain, under Charles IV, joined revolutionary France against Great Britain during the French Revolutionary Wars.
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B.
Treaty of San Ildefonso (1800)
The Treaty of San Ildefonso (1800) was a secret agreement by which Spain retroceded the vast territory of Louisiana to France, reshaping the balance of power in North America and paving the way for the Louisiana Purchase.
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C.
Treaty of El Pardo
The Treaty of El Pardo was an 18th-century agreement between Spain and Portugal that redefined their colonial boundaries, including Spain’s claims in the region that would become Equatorial Guinea.
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D.
Treaties of Córdoba
The Treaties of Córdoba were the 1821 agreements between Spanish royalist authorities and Mexican insurgents that recognized Mexico’s independence and laid the groundwork for its first constitutional order.
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E.
Treaty of Zaragoza
The Treaty of Zaragoza was a 1529 agreement between Spain and Portugal that defined their spheres of influence in Asia and the Pacific by establishing an antimeridian to the earlier Treaty of Tordesillas.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Treaty of San Ildefonso (1777) Target entity description: The Treaty of San Ildefonso (1777) was an agreement between Spain and Portugal that redefined their colonial boundaries, particularly in South America and Africa, and confirmed Spanish control over territories that would become Equatorial Guinea.
-
A.
Treaty of San Ildefonso (1796)
The Treaty of San Ildefonso (1796) was an alliance agreement in which Spain, under Charles IV, joined revolutionary France against Great Britain during the French Revolutionary Wars.
-
B.
Treaty of San Ildefonso (1800)
The Treaty of San Ildefonso (1800) was a secret agreement by which Spain retroceded the vast territory of Louisiana to France, reshaping the balance of power in North America and paving the way for the Louisiana Purchase.
-
C.
Treaty of El Pardo
The Treaty of El Pardo was an 18th-century agreement between Spain and Portugal that redefined their colonial boundaries, including Spain’s claims in the region that would become Equatorial Guinea.
-
D.
Treaties of Córdoba
The Treaties of Córdoba were the 1821 agreements between Spanish royalist authorities and Mexican insurgents that recognized Mexico’s independence and laid the groundwork for its first constitutional order.
-
E.
Treaty of Zaragoza
The Treaty of Zaragoza was a 1529 agreement between Spain and Portugal that defined their spheres of influence in Asia and the Pacific by establishing an antimeridian to the earlier Treaty of Tordesillas.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
bilateral treaty
ⓘ
boundary treaty ⓘ international treaty ⓘ |
| alsoKnownAs |
Treaty of San Ildefonso (1777)
ⓘ
surface form:
First Treaty of San Ildefonso
|
| appliesTo | colonial possessions of Spain and Portugal in the late 18th century ⓘ |
| appliesToJurisdiction |
Portuguese Empire
ⓘ
Spanish Empire ⓘ |
| concerns |
islands in the Gulf of Guinea
ⓘ
territories in present-day Argentina ⓘ territories in present-day Brazil ⓘ territories in present-day Paraguay ⓘ territories in present-day Uruguay ⓘ territories in the Amazon basin ⓘ territories in the Río de la Plata region ⓘ |
| confirmedControlOf |
Annobón
ⓘ
surface form:
Annobón for Spain
Corisco and nearby islets for Spain ⓘ Fernando Pó (Bioko) for Spain ⓘ |
| countrySignatory |
Kingdom of Portugal
ⓘ
Kingdom of Spain ⓘ |
| dateSigned | 1777-10-01 ⓘ |
| definedBoundaryBetween |
Portuguese America
ⓘ
Spanish America ⓘ |
| effectOn |
Spanish–Portuguese colonial frontier in Africa
ⓘ
Spanish–Portuguese colonial frontier in South America ⓘ |
| fieldOfWork |
colonial administration
ⓘ
international law ⓘ |
| follows | Treaty of Madrid (1750) ⓘ |
| grantedToPortugal | recognition of Portuguese possessions in Brazil ⓘ |
| grantedToSpain | rights over parts of the Gulf of Guinea coast ⓘ |
| hasConsequence | redefinition of spheres of influence between Spain and Portugal ⓘ |
| hasLegalStatus | ratified treaty ⓘ |
| historicalOutcome | laid basis for Spanish territories that became Equatorial Guinea ⓘ |
| language |
Portuguese
ⓘ
Spanish ⓘ |
| legalForm | written treaty ⓘ |
| mainSubject |
colonial boundaries in Africa
ⓘ
colonial boundaries in South America ⓘ |
| partOf | series of Iberian boundary settlements ⓘ |
| placeSigned | San Ildefonso, Spain ⓘ |
| purpose | to settle territorial disputes between Spain and Portugal ⓘ |
| relatedTo |
Treaty of El Pardo
ⓘ
surface form:
Treaty of El Pardo (1778)
|
| replaces | Treaty of Madrid (1750) ⓘ |
| signatoryMonarch |
Charles III of Spain
ⓘ
Maria I of Portugal ⓘ |
| subjectOf | Spanish–Portuguese diplomatic history ⓘ |
| timePeriod | 18th century ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Treaty of San Ildefonso (1777) Description of subject: The Treaty of San Ildefonso (1777) was an agreement between Spain and Portugal that redefined their colonial boundaries, particularly in South America and Africa, and confirmed Spanish control over territories that would become Equatorial Guinea.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
First Treaty of San Ildefonso (1777)
this entity surface form:
First Treaty of San Ildefonso