 At the north end of the small courtyard is a chapel and at the southern end is an esplanade . The esplanade is raised above the rest of the courtyard ; the vaulted area beneath it would have provided storage and could have acted as <unk> and shelter from missiles . <unk> the west of the courtyard is the hall of the Knights . Though probably first built in the 12th century , the interior dates from the 13th @-@ century <unk> . The tracery and delicate decoration is a sophisticated example of Gothic architecture , probably dating from the 1230s . 
