Linstock Castle is a farmhouse in Linstock, Cumbria, originally built as a tower house in the 12th or early 13th century. The tower has large blocks of red sandstone, mostly taken from the neary section of Hadrian's Wall. It was used as a palace for the Bishops of Carlisle from c.1219 to the early 14th century. Later it was used as a prison and for refuge for villagers in border raids. For 6 days In March 1307, King Edward I and his court were entertained here, whilst Parliament was held in Carlisle. Linstock Castle is Grade II* listed on the National Heritage List for England.