The ascension of King John II of Portugal in 1481 revived the royal interest in African trade. In 1482, upon erecting the fortress of São Jorge da Mina to access the Akan goldfields and markets, John II overhauled the old houses and organized the system into two new institutions in Lisbon - the royal trading house, the "Casa da Mina e Tratos de Guiné", focused on commercial aspects of African trade (goods, licenses, dues), and the separate royal naval arsenal, the "Armazém da Guiné", to handle nautical matters (ship construction, nautical supplies, hiring of crews, etc.)