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To protect the marches of Brittany, the dukes fortified the big towns. In 1376, Raoul VII got an authorisation to transform the castle into a defensive fortress. Around the castle, an important fortification was built with towers and 3 doors. The Tower of Papegaut, the Tower of Pas d'Âne, the Tower of Capitaine, and parts of the former fortifications can still be found today.