This long-awaited publication elucidates a remarkable monument, now preserved in situ beside the Tower of London. Excavations at Tower Hill in 1979 uncovered substantial remains of the medieval postern gate at the junction of the City's defensive wall and the moat of the Tower of London. The postern gate was constructed between 1297 and 1308, towards the close of the reign of Edward I. It formed a defensible terminus to the City wall and a minor gateway suitable for pedestrian traffic. The base of a rectangular tower survived on the south side of the gate passage, along with a staircase...