 Pinho Leal, in the book "Portugal Antigo e Moderno" (1876) stated that it is supposed that a small and ancient fort, named " Forte de Torrão", was built in the 15th century, during the reign of John I of Portugal.In the end of the 16th century, the shipbuilding industry started developing in the area of Ribeira, a shipyard located around the fort.The fortification was financed by Póvoa de Varzim Town Hall, and had as main goal to protect the local merchant community from privateer attacks.