There are three legends, the local imaginary, involving the castle.
According to one, with the castle in possession of the Moors, was preparing King Afonso Henriques to resume it. By watching the crows flew over the castle, it seemed that repeated “not now, tomorrow morning.” For this reason, she waited until dawn to deliver the attack, managing to retake the castle.
Another legend says that under the castle there is a dormant volcano, responsible for heating the hot water supply.
The latter ensures that there is a secret underground passage which allows communication with a castle church, opposite the city.