The river port of Pontecesures was one of the oldest ports in Galicia, a shipyard of the Armada of Castilla in the fight against Saracens and Normans, and the base of the salt trade monopoly in the 15th century. A place of passage and entry since time immemorial, traces of Phoenicians, Greeks, Carthaginians, and the Roman Empire have been found in Pontecesures.
Despite not having a sea, Pontecesures was a maritime power. Commercial relations with the Phoenicians and Carthaginians have been documented since around the 6th century BC. The river port of Pontecesures served as the outer port of Iria Flavia. This relationship with the sea continued in the Middle Ages, when the port functioned as a shipyard for warships in Castilla's fight against the Muslims. The origin of its name is probably from the bridge that Rome built between the two banks of the Ulla River, navigable up to that point, and the Latin word "cesuris," referring to the fact that, during the Roman Empire, this town was where population censuses were conducted. According to legend, the remains of the Apostle Santiago arrived in Galicia via the Ulla River. The ten-arch bridge, which still structures this area today, was renovated in the Middle Ages by Master Mateo, creator of the Portico of Glory of the Santiago cathedral, and consolidated with its current appearance in the early 20th century. In Pontecesures, four castros are preserved: Castro Cortinallas, very close to the river
O Castro, in the neighborhood of the same name and now privately owned