Castle Hill was originally a late 11th century earth and timber ringwork fortress, founded by Robert de Mortain. In the early 12th century, King Henry I filled in the ringwork and founded the earthwork motte and baileys castle. The oval motte is encased by a ditch and is crowned by a high breastwork, which is still in perfect condition. To the west of the motte is a square bailey and to the south, a smaller semi-lunar bailey. Both baileys are outlined by the remains of there encasing ramparts, ditches and counterscarp banks. Excavations in 1904, found that the motte, all the ditches and the ramparts of the baileys had been revetted in stone. By the mid 14th century, the castle had been abandoned. 3 miles west is Thurland Castle and 3 miles north is Over Hall, Ireby.