Most remarkable monument of its kind in Britain. Provision is made for four passage-ways, two of 17’ in width for vehicular traffic in the centre and a 6’ side walk for foot passengers at either end, flanked in its turn by a roughly quadrant-shaped bastion, which acted as a guard chamber. The sideways were vaulted in brick. The S sideway, which is 32’ long and the bastions are still standing, the N to a height of 15’ the S 12’. Monument originally a two-arched triumphal arch of 75 AD. In 125 AD when the town wall was constructed it was converted into a main gate of the town. Pedestrian ways and guardhouses were added on either side. The gateway was clocked within the Roman period but the blocking of the N half is probably late Saxon. <1>