Skip to main content
CountryReports

Expanded History

History of Sao Tome and Principe

From antiquity to the modern era — the historical eras, key events, and narrative that shaped Sao Tome and Principe.

Speed

Overview

The islands were first discovered by Portuguese navigators between 1469 and 1472. The first successful settlement of Sao Tome was established in 1493 by Alvaro Caminha, who received the land as a grant from the Portuguese crown. Principe was settled in 1500 under a similar arrangement. By the mid-1500s, with the help of slave labor, the Portuguese settlers had turned the islands into Africa’s foremost exporter of sugar. Sao Tome and Principe were taken over and administered by the Portuguese crown in 1522 and 1573, respectively.

Sugar cultivation declined over the next 100 years, and by the mid-1600s, Sao Tome was little more than a port of call for bunkering ships. In the early 1800s, two new cash crops, coffee and cocoa, were introduced. The rich volcanic soils proved well suited to the new cash crop industry, and soon extensive plantations (rocas), owned by Portuguese companies or absentee landlords, occupied almost all of the good farmland. By 1908, Sao Tome had become the world’s largest producer of cocoa, still the country’s most important crop.

The rocas system, which gave the plantation managers a high degree of authority, led to abuses against the African farm workers. Although Portugal officially abolished slavery in 1876, the practice of forced paid labor continued. In the early 1900s, an internationally publicized controversy arose over charges that Angolan contract workers were being subjected to forced labor and unsatisfactory working conditions. Sporadic labor unrest and dissatisfaction continued well into the 20th century, culminating in an outbreak of riots in 1953 in which several hundred African laborers were killed in a clash with their Portuguese rulers. This "Batepa Massacre" remains a major event in the colonial history of the islands, and the government officially observes its anniversary.

By the late 1950s, when other emerging nations across the African Continent were demanding independence, a small group of Sao Tomeans had formed the Movement for the Liberation of Sao Tome and Principe (MLSTP), which eventually established its base in nearby Gabon. Picking up momentum in the 1960s, events moved quickly after the overthrow of the Salazar and Caetano dictatorship in Portugal in April 1974. The new Portuguese regime was committed to the dissolution of its overseas colonies; in November 1974, their representatives met with the MLSTP in Algiers and worked out an agreement for the transfer of sovereignty. After a period of transitional government, Sao Tome and Principe achieved independence on July 12, 1975, choosing as its first President the MLSTP Secretary General, Manuel Pinto da Costa.

In 1990, Sao Tome became one of the first African countries to embrace democratic reform. Changes to the constitution, including the legalization of opposition political parties, led to nonviolent, free, and transparent elections in 1991. Miguel Trovoada, a former Prime Minister who had been in exile since 1986, returned as an independent candidate and was elected President. Trovoada was re-elected in Sao Tome’s second multiparty presidential election in 1996. The Party of Democratic Convergence (PCD) toppled the MLSTP to take a majority of seats in the National Assembly, with the MLSTP becoming an important and vocal minority party. Municipal elections followed in late 1992, in which the MLSTP came back to win a majority of seats on five of seven regional councils. In early legislative elections in October 1994, the MLSTP won a plurality of seats in the Assembly. It regained an outright majority of seats in the November 1998 elections.

The Government of Sao Tome fully functions under a multiparty system. Presidential elections were held in July 2001. The candidate backed by the Independent Democratic Action Party, Fradique de Menezes, was elected in the first round and inaugurated on September 3. Parliamentary elections held in March 2002 led to a coalition government after no party gained a majority of seats. An attempted coup d’etat in July 2003 by a few members of the military and the Christian Democratic Front (mostly representative of former Sao Tomean volunteers from the apartheid-era Republic of South African Army) was reversed by international, including American, mediation without bloodshed. In September 2004, President de Menezes dismissed the Prime Minister and appointed a new cabinet, which was accepted by the majority party. In June 2005, following public discontent with oil exploration licenses granted in the Joint Development Zone (JDZ) with Nigeria, the MLSTP, the party with the largest number of seats in the National Assembly, and its coalition partners threatened to resign from government and force early parliamentary elections. After several days of negotiations, the President and the MLSTP agreed to form a new government and to avoid early elections. The new government includes Maria Silveira, the well-resp

Historical Eras

The major periods of {country}’s history at a glance.

  1. Portuguese Discovery & Settlement

    1470 – 1522

    Portuguese navigators discovered the uninhabited islands between 1469 and 1472, with the first permanent settlement established on São Tomé in 1493 under Álvaro Caminha. Príncipe was settled shortly after in 1500. The islands quickly attracted colonists and enslaved Africans, laying the groundwork for a plantation economy in one of the Atlantic's most strategically positioned archipelagos.

  2. Sugar Colony Era

    1522 – 1800

    After the Portuguese Crown took direct administrative control of São Tomé in 1522 and Príncipe in 1573, the islands became Africa's foremost sugar exporter, driven entirely by enslaved labor. Sugar's dominance waned by the mid-1600s as Brazilian competition intensified, reducing São Tomé largely to a provisioning stop for transatlantic slave ships. The islands entered a prolonged period of economic stagnation and periodic attacks by Dutch and French raiders.

  3. Cocoa & Coffee Plantation Era

    1800 – 1953

    The introduction of coffee and cocoa in the early 19th century revived the plantation economy, and by 1908 São Tomé was the world's largest cocoa producer. Vast estates known as roças, owned by Portuguese companies and absentee landlords, dominated the land and relied on African contract laborers under conditions widely condemned as forced labor. This era culminated in the Batepa Massacre of 1953, in which Portuguese authorities killed several hundred African workers, galvanizing nascent independence sentiment.

  4. Late Colonial & Liberation

    1953 – 1975

    The Batepa Massacre spurred Santomean activists to form the Movement for the Liberation of São Tomé and Príncipe (MLSTP) in the late 1950s, which organized from exile in Gabon. Portugal's Carnation Revolution of April 1974 brought a new Lisbon government committed to decolonization; negotiations in Algiers between Portuguese officials and the MLSTP rapidly produced an independence agreement. São Tomé and Príncipe formally became independent on July 12, 1975, with MLSTP leader Manuel Pinto da Costa as its first President.

  5. One-Party Socialist State

    1975 – 1991

    Under Pinto da Costa, the MLSTP governed as the sole legal party, nationalizing the roças and aligning the country initially with Marxist-bloc states before pragmatically distancing itself as the economy deteriorated in the 1980s. A coup attempt in 1988 underscored growing internal discontent. By 1990, facing economic crisis and continental pressure for reform, the government legalized opposition parties and amended the constitution, setting the stage for multiparty democracy.

  6. Democratic & Modern Era

    1991 – present

    São Tomé held its first free elections in 1991, making it among Africa's earliest multiparty democracies, though political instability persisted through frequent government changes and coup attempts in 1995 and 2003. Miguel Trovoada and later Fradique de Menezes led the country through turbulent coalitional politics while the economy remained heavily dependent on cocoa and foreign aid. The discovery of offshore oil in the Gulf of Guinea and a production-sharing agreement signed with Nigeria in 2005 introduced significant new prospects for economic transformation.

Timeline Preview

The first 7 key events. View the full chronology on the timeline page.

  1. 1501 – 1600

    Sao Tome colonized by the Portuguese.

    Sao Tome colonized by the Portuguese, who bring in slaves to work sugar plantations. Becomes important staging post for slave trade.

  2. 1800

    Cocoa introduced. Sao Tome develops into one of world’s main cocoa producers.

    Cocoa introduced. Sao Tome develops into one of world’s main cocoa producers.

  3. 1951

    Becomes overseas province of Portugal.

    Becomes overseas province of Portugal.

  4. 1975

    Independence

    Independence, with Manuel Pinto da Costa (MLSTP) as president and Miguel Trovoada as prime minister. Plantations nationalized, strong ties built up with communist countries.

  5. 1980

    Government scales down links with communist world as economy deteriorates.

    Government scales down links with communist world as economy deteriorates. Declares itself nonaligned, seeks Western support for recovery plans.

  6. 1988

    Coup attempt.

    Coup attempt.

  7. 1997

    Unrest over economic conditions.

    Unrest over economic conditions.