Ballyloughan CastleBallyloughan Castle is a ruined castle and National Monument near Bagenalstown, County Carlow in Ireland. A twin-towered gatehouse, the hall and foundations of one of the corner towers, dating to about 1300, remain.HistoryBallyloughan is at the western end of a glacial ridge near Mount Leinster. The castle is roughly square in form, and the walls are in places up to 50 ft high and 5 ft thick. Nothing is recorded of the castle's early history, though the majority of its features are typical of 13th century construction.