 This gatehouse replaced the Great Gatehouse as the main entrance, and would have contained a porter's lodge, defended by a combination of a portcullis and an 82-foot (25 m) long barbican.A inner bailey was approximately 50-foot by 75-foot (23 m by 15 m), defended by a 20-foot (6 m) high mantlet wall, was constructed in the 1380s behind John of Gaunt's Gatehouse and the Great Gatehouse.This complex comprised a vaulted inner gatehouse, square, and six buildings, including an antechamber, kitchen and bakehouse.