Ross Castle (Irish: Caisleán an Rois) is a 15th-century tower house and keep on the edge of Lough Leane, in Killarney National Park, County Kerry, Ireland . . . . The castle is typical of strongholds of Irish chieftains built during the Middle Ages. The tower house had square bartizans on diagonally opposite corners and a thick end wall. The tower was originally surrounded by a square bawn defended by round corner towers on each end.
Ross Castle perches in an inlet of Lough Leane. It is likely that the Irish chieftain O’Donoghue Mór built it in the fifteenth century. . . . Ross Castle was the last place in Munster to hold out against Cromwell. Its defenders, then led by Lord Muskerry, took confidence from a prophecy holding that the castle could only be taken by a ship. Knowing of the prophecy, the Cromwellian commander, General Ludlow, launched a large boat on the lake. When the defenders saw it, this hastened the surrender – and the prophecy was fulfilled.