First Treaty of San Ildefonso

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The first Treaty of San Ildefonso between Spain and Portugal was signed on October 1, 1777 at La Granja de San Ildefonso Castle . It regulated territorial claims over the colony of Sacramento in the La Plata region in today's Uruguay , but also over the islands of Annobón and Fernando Póo in the Gulf of Guinea and other territories on the coast of Nigeria as well as the inlets of the Ogooués in exchange for a Spanish withdrawal from the south Brazil .

This treaty meant a rapprochement between the two Iberian monarchies, the Portuguese Queen Maria I and the Spanish King Carlos III. , after decades of tensions and disputes since Portuguese independence in 1640 and the Portuguese-English alliance . The treaty gave up the territory of Pombal and reaffirmed the Treaty of Madrid of 1750.