Belém Tower stands beside the Tagus at the western edge of Lisbon, where the river opens toward the Atlantic. Its elegant profile can make it seem like a ceremonial pavilion, but the monument was built as part of a defensive system designed to protect the entrance to the port. The Portuguese cultural authority traces the strategy to King João II and its continuation under Manuel I, when Lisbon’s maritime commerce and strategic importance were expanding.
Construction began around 1514 under the architect Francisco de Arruda, according to UNESCO. The tower was dedicated to Saint Vincent, Lisbon’s patron, and commemorated Vasco da Gama’s voyage while guarding the harbour. It was not an isolated fort: the original plan linked it with other strongpoints, including Cascais and a tower on the south bank. The crossfire of artillery was intended to make passage into the Tagus difficult for hostile ships.
