The medieval postern gate by the Tower of London
This publication elucidates a remarkable monument, now preserved in situ beside the Tower of London. Constructed between 1297 and 1308, the postern gate formed a defensible terminus to the city wall and a minor gateway suitable for pedestrian traffic. The survival of the remains on the south side of the gate passage was due to a dramatic landslip in 1431 or 1440, when the southern part of the structure slipped at least three metres down the side of the moat. The gate was rebuilt and cartographic evidence shows a postern gate on the site until at least the early 17th century.
Monograph Series 29
MoLAS 2006. ISBN 1-901992-60-8. Pb74pp. 47 bl/wh ills.