Ely Castle, © Chris Gunns and licensed for reuse under cc-by-sa/2.0

Ely Castle, also known as Cherry Hill Castle, was a motte and bailey built by William I in 1070 but its use was short lived. However it was refortified in 1140 during the Civil War but was captured by King Stephen. The motte is mainly natural, 40 feet high with a diameter of 250 feet and stands within a rectangular bailey 300 feet by 250 feet. By 1229 the castle had been replaced by a windmill.