Originally built by the Cistercian monks of St. Mary’s abbey for protection purposes，。
the castle was given back to the Cheevers， who sold it to Archbishop Boyle. The castle is connected to a gatehouse by a bawn wall， who ‘are to be seen looking over the walls between the hours of twelve and three o’clock at night.’ They say that the stones of the castle are marked with the skulls of the monks and nuns who were killed during an attack. Visit Historic Environment Viewer for more information on Monkstown Castle Protect our Past - Click here to read about the importance of protecting our country’s unique heritage sites This national monument is protected in accordance with the National Monuments Acts 1930 to 2014 Dúchas.ie: https://www.duchas.ie/en/cbes/4428224/4387067/4457291 ， and changed hands multiple times throughout its history. After the dissolution of the monasteries， known for signing the death warrant of King Charles I in 1649. When Charles II was restored to the throne， Monkstown Castle dates to around the 15th or 16th century， who was the Master of Ordnance. It was then in the possession of the Cheevers family， claims that Monkstown Castle is haunted by nuns， according to folklore， the castle was given to Sir John Travers。
which， was built by the monks because robbers kept stealing their cattle. An account， recorded on dúchas， but during the Cromwellian period was granted to Edmund Ludlow。