The Fernandine Wall (Muralha Fernandina), also known as the Fernandina Fortress, is a remarkable example of medieval defensive architecture in Porto. Its construction began in 1336 by order of King Ferdinand I as part of efforts to strengthen the city's fortifications amid political instability and external threats. Named after the monarch, the wall became a key element in Porto’s defense system and a symbol of its strategic importance.
Originally, the wall encircled the city, protecting it from both land invasions and river attacks via the Douro. Today, several well-preserved segments remain, including gates, towers, and portions of wall integrated into the urban landscape. A particularly notable section can be seen in the Miragaia area, offering scenic views over the river and the historic city center.
The architecture of the wall combines military functionality with Gothic influences, characteristic of 14th-century fortifications. Now recognized as a national heritage site, the Fernandine Wall is officially protected and preserved. It serves not only as a relic of Porto’s past but also as a cultural landmark connecting the city's medieval legacy with its contemporary identity.