Ely Castle was in the cathedral city of Ely in Cambridgeshire. (). Its probable site is a mound near the cathedral which is now called Cherry Hill. This was a motte and bailey castle built by William I in 1070 in his conflict with Hereward the Wake to subdue the Isle of Ely. Once Ely was quiescent the motte was abandoned. However it was refortified in 1140 during the Anarchy by Bishop Nigel but surrendered to King Stephen. In 1143 Geoffrey de Mandeville was placed in charge of the castle. A castle in Ely was said to have been taken and destroyed by Falkes de Breauté in 1216. During the Second Barons' War half a century later, Ely with its fortifications was captured in 1268. It is thought that the castle built by Bishop Nigel was demolished soon afterwards.