In the Middle Ages the castle was surrounded by a moat conjoining with the River Aura, the castle effectively lying on an island. The keep was completed in the early 15th century. Construction of the bailey was begun in the late 15th century and finished in the 16th. The bailey is not as heavily fortified as the keep, but it has several turrets. The Renaissance construction work included heavy modification of nearly all the rooms in the older medieval part of the castle. Since the Renaissance no additions have been made to the castle.