The Leslie Grinsell Memorial Lecture: the Rediscovery of Gloucester Castle, archaeological investigations 2014 – 2019.
The castle was rediscovered during excavations on the Gloucester Prison site. Established as a motte and bailey castle during the reign of William the Conqueror it was subsequently much enlarged by William Rufus. Further work was completed under Henry I, II and III and then by Edward I, II and III. By the mid-Fifteenth Century the castle had fallen into disrepair was no longer considered defensible.