Queen Maria I of Portugal and King …

Years: 1780 - 1791
Queen Maria I of Portugal and King Charles III of Spain sign the Treaty of El Pardo in 1778, which cedes Bioko, adjacent islets, and commercial rights to the Bight of Biafra between the Niger and Ogoue rivers to Spain.

Brigadier Felipe José, Count of Arjelos, sails from Uruguay to formally take possession of Bioko from Portugal, landing on the island on October 21 1778.

After sailing for Annobón to take possession, the Count dies of disease caught on Bioko and the fever-ridden crew mutinies.

The crew lands on São Tomé instead where they are imprisoned by the Portuguese authorities after having lost over eighty percent of their men to sickness.

As a result of this disaster, Spain will hereafter be hesitant to invest heavily in their new possession.

However, despite the setback, Spaniards begin to use the island as a base for slave-hunting on the nearby mainland with the support of British merchants.

Between 1778 and 1810, the territory of what will become Equatorial Guinea is administered by the Viceroyalty of the Río de la Plata, based in Buenos Aires.

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