The island was discovered by the
Portuguese on 1 January 1473; it obtained its name from that date ("New Year"). However, Spanish explorer Diego Ramirez de la Diaz first spotted the island in 1470 and named it San Antonio. It was apparently uninhabited until colonized under the Portuguese from 1474, primarily by enslaved Africans from
Angola via
São Tomé Island. These slaves (who the Portuguese called ) are considered the first members of Annobonese society. A state of anarchy ensued, leading to an arrangement by which the island was administered by a body of five natives, each of whom held the office of governor during the period that elapsed until ten ships landed at the island. This autonomous government continued, with the island claimed by both Spain and Portugal, until the authority of Spain was re-established in the latter part of the 19th century. The island briefly became part of the
Elobey, Annobón and Corisco colony until 1909. The
British erected a fort at St Antony in 1801, eventually legalized through a lease from the Spanish government in 1827. The base was used by the British to suppress the
Atlantic slave trade. During the final years of the administration of
Francisco Macías Nguema, the first
president of Equatorial Guinea, the island was called Pigalu or Pagalu. The population felt prejudice against them in Equatorial Guinea and some began advocating separatist movements. In 1993, the central government isolated the island, expelling foreigners including humanitarian organizations. The population rebelled and attacked the governor's residence. The government replied with two extrajudicial executions. International pressure eased hostilities, and political prisoners were released. It was mostly due to this small island that Equatorial Guinea asked for observer status just after the
Community of Portuguese Language Countries was formed in 1996, which led to a visit to Equatorial Guinea, in 1998, by the Portuguese foreign minister,
Jaime Gama. Its historic, ethnographic, and religious identity is reflected in its provincial flag. In 2006, Equatorial Guinea achieved observer status with the hand of
São Tomé and Príncipe. It kept lobbying to become a full member, contrary to international pressure that wanted to isolate the country due to human rights violations, becoming a full member in 2014 with the very active support of
Portuguese-speaking Africa, with the Portuguese language being restored as an official language. == Geography and geology ==