 The damage done to the castle during the second siege was immediately repaired in 1216 and 1221 by Cigogne on behalf of John 's successor Henry III , who further strengthened the defences . The walls of the Lower Ward were rebuilt in stone , complete with a gatehouse in the location of the future Henry VIII Gate , between 1224 and 1230 . Three new towers , the Curfew , Garter and the Salisbury towers , were constructed . The Middle Ward was heavily reinforced with a southern stone wall , protected by the new Edward III and Henry III towers at each end . 
