
Castlelough Castle, also known as McCarthy Mor Castle, sits on a low promontory in Lough Leane near Killarney, County Kerry. Founded possibly in the early 13th century by Anglo-Norman De Roches, the castle became the stronghold of the Gaelic MacCarthys who ruled South Kerry from this and other strategic locations. The castle remained with the MacCarthy family until the mid-18th century when it was sold to British colonel William Crosbie, by which time it had already begun its decline into ruin. The site remains historically significant as a focal point of medieval Gaelic and Anglo-Norman power struggles in Kerry.