The first defensive fortifications date back from the period of Roman occupation
The first defensive fortifications date back from the period of Roman occupation. This primitive defense would have been increased in the following centuries, successively by Visigoths and Muslims.
Porto de Mos became a strategic point in the defense of Leiria and Coimbra during the Christian Reconquest of the Iberian peninsula. With the encouragement of the settlement under the reign of D. Sancho I (1185 - 1211), the town prospered, and its defense received important works of improvement.
The defensive structure of the castle was severely damaged by an earthquake in 1755 and, again, in 1909. It was classified as a National Monument in 1910.
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Ruins of the castle