Oxford Castle

Oxford Castle is a large, partly ruined Norman medieval castle on the western side of central Oxford in Oxfordshire, England. Most of the original moated, wooden motte and bailey castle was replaced in stone in the 11th century and played an important role in the conflict of the Anarchy. In the 14th century the military value of the castle diminished and the site became used primarily for county administration and as a prison.

• http://en.wikipedia.org/wiki/Oxford Castle