 The curtain walls of both enclosures date largely to the 14th century, though much augmented by later building, particularly to the north where most of the remaining structures are located.The 16th-century gatehouse is on the inland side of the Nether Bailey, and comprises twin D-plan towers flanking an arched entrance passage.Formerly the passage was defended by a portcullis and a double set of doors, with guard rooms either side.