Ludlow Castle is a ruined medieval fortification in the town of the same name in the English county of Shropshire, standing on a promontory overlooking the River Teme. The castle was probably founded by Walter de Lacy after the Norman conquest and was one of the first stone castles to be built in England. During the civil war of the 12th century the castle changed hands several times between the de Lacy's and rival claimants, and was further fortified with a Great Tower and a large outer bailey. In the mid-13th century, Ludlow was passed on to Geoffrey de Geneville who rebuilt part of the inner bailey, and the castle played a part in the Second Barons' War.