Ross Castle is a 15th-century tower house and keep on the edge of Lough Leane, in Killarney National Park, County Kerry, Ireland.
It was built in the late 15th century by local ruling clan the O'Donoghues Mor (Ross).
Ownership changed hands during the Second Desmond Rebellion of the 1580s to the MacCarthy Mór.
He then leased the castle and the lands to Sir Valentine Browne ancestor of the Earls of Kenmare.
The castle was amongst the last to surrender to Oliver Cromwell's Roundheads during the Irish Confederate Wars
It was only taken when artillery was brought by boat via the River Laune.
The castle is operated by the Office of Public Works, and is open to the public seasonally with guided tours.
Reference: Wikipedia