 The rectangular west tower was a relatively short defensive structure , designed to protect the more vulnerable western slope of the ridge . A similar tower in the south overlooks the entrance to the castle . At the north end of the castle is the hall , stretching across the courtyard ; in the east corner is an additional building , probably built by the English at the end of the 13th century . Although the hall is relatively large , 50 by 27 feet ( 15 by 8 m ) , these buildings follow a simpler design to those current in England at the time , where a combination of a hall , chamber and a service block in castles was becoming more common . 
