Treaty of San Ildefonso (1777)

E86044

bilateral treaty boundary treaty international treaty

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.

Aliases (2)

Statements (46)

Predicate	Object
instanceOf	bilateral treaty → boundary treaty → international treaty →
alsoKnownAs	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 for Spain → Corisco and nearby islets for Spain → Fernando Pó (Bioko) for Spain →
countrySignatory	Kingdom of Portugal → Kingdom of Spain NERFINISHED →
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 (1778) →
replaces	Treaty of Madrid (1750) →
signatoryMonarch	Charles III of Spain NERFINISHED → Maria I of Portugal NERFINISHED →
subjectOf	Spanish–Portuguese diplomatic history →
timePeriod	18th century →

Referenced by (3)

Subject (surface form when different)	Predicate
Treaty of San Ildefonso (1777) ("First Treaty of San Ildefonso") →	alsoKnownAs
Treaty of San Ildefonso (1796) ("First Treaty of San Ildefonso (1777)") →	predecessor
Spanish colonization of Equatorial Guinea →	treatyBasis