Castle

National Monument in state ownership No. 491. Situated on an E-facing slope overlooking the River Liffey. Rectangular three-storey tower house with a projecting stair turret at the NE angle. It originally had a structure attached at the W side, where the springing of a barrel vault is visible. A doorway above the present entrance gave access from the original building to the later addition. Another barrel vault roofs the third floor in the surviving portion. Ascent to the first floor appears to have been by stairs in the W structure. This floor level has a large fireplace, decorative mouldings on the windows, and a garderobe with a chute built into the wall thickness of the stair turret. The site of another castle (WI005-032----) is indicated on the OS 6-inch map 300m to the E. The above description is derived from the published 'Archaeological Inventory of County Wicklow' (Dublin: Stationery Office, 1997). In certain instances the entries have been revised and updated in the light of recent research. Date of upload/revision: 17 December 2008 This monument is subject to a preservation order made under the National Monuments Acts 1930 to 2014 (PO no. 149/1940).

Built in the late 15th or early 16th century, Threecastles is a well-preserved tower house that reflects the defensive and domestic architecture of the late medieval period in Ireland. Its importance lies in its structural integrity and its status as a National Monument, offering insight into regional building practices and landholding patterns of the time.