Heritage Open Day: Dalton Castle is one of the oldest properties cared for by the National Trust in the North, with over 650 years of history. The 14th century tower known as Dalton Castle was formerly the manorial courthouse of Furness Abbey. Here the abbott exercised his right to hold manorial courts and administer justice within the lordship of Furness, as authorised by the abbey's foundation charter of 1127. The building would have contained not only the courtroom and one or two other rooms in which the business of the lordship was transacted, but also a gaol, guardrooms and stores.