Slave fort
A slave fort or slave castle was a fortification designed to provide a defensible area in which enslaved victims would be kept until ships were ready to embark them and forcibly migrate them during the atlantic slave trade.{{cite web |title=Slave forts case study |url=http://archive.understandingslavery.com/index.php-option=com_content&view=article&id=374&Itemid=231.html |website=archive.understandingslavery.com |publisher=Understanding Slavery Initiative |access-date=21 August 2021}} A slave fort was a militarized factory (trading post) which evolved at locations where the slave trade played a significant economic role on the coast of Africa. These forts were built by the state or chartered companies from nine European countries.{{cite book |last1=Lawrence |first1=A. W. |title=Trade Castles and Forts of West Africa |date=1964 |url=https://www.aluka.org/stable/10.5555/al.ch.document.sip200007?searchUri=so%3Dps_collection_name_str%2Basc%26Query%3DTrade%2BCastles%2Band%2BForts%2Bof%2BWest%2BAfrica&loggedin=true |language=English}}
Portuguese origins
In 1441 Henry the Navigator initiated the Portuguese exploration of the African coast. With a newly designed ship, the caravel, Portuguese explorers were able to sail further south. Their exploration was accompanied by repeated kidnappings of particularly Berbers who were enslaved and sold at newly created slave markets in Lisbon.{{cite web |title=Nuño Tristão: Early Portuguese Explorer|url=https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/nuno-tristao-early-portuguese-explorer |website=www.encyclopedia.com |publisher=Encyclopedia.com |access-date=23 August 2021}} Nuno Tristão and Gonçalo de Sintra explored as far south as the Bay of Arguin, where the Portuguese established a trading post on the island of Arguin. Henry ordered the first feitoria or factory to be built there in 1448, although there are also records that King Afonso V also ordered a fort to be built in 1462.{{cite web |title=Arguin [Arguim] |url=https://hpip.org/en/Contents/Place/221 |website=HPIP |publisher=Heritage of Portuguese Influence |access-date=24 August 2021}}
Elmina Castle was built in 1482 in present-day Elmina, Ghana (formerly the Gold Coast). It was the first of many slave forts built by Europeans along the coast of West Africa. João II decided to build the fort shortly after coming to the Portuguese throne. He appointed Diogo de Azambuja to fulfill the task, and supplied him with a pre-fabricated fort in kit form, along with 600 men. This enabled the fort to be built as the first European prefabricated building in sub-saharan Africa. This proved useful as the indigenous people did not want the Portuguese to build the fort despite Azambuja's initial success in some negotiations.{{cite journal |last1=Rui de Pina |editor1-last=Newitt |editor1-first=Malyn |title=Crónica de El-Rey D.João II |journal=The Portuguese in West Africa, 1415–1670 |date=2010 |trans-title=The Foundation of the Castle and City of São Jorge da Mina |publisher=Cambridge University Press |location=Cambridge}}{{rp|93}}