First City wall built 200 At almost two miles long, surrounding an area of 330 acres and between 6-9 feet in width and with a height of 18 feet, the City was accessed by gates on each main thoroughfare: Aldgate, Bishopsgate, Newgate and Ludgate. Cripplegate led into the Fort already established in the northwest corner of the City. Aldersgate on the west side was constructed a little later, sometime during the fourth century.