Kilclief Castle (Irish: Caislean Cill Cléithe) is a tower-house castle beside Strangford Lough and 2.5 miles (4 km) south of the village of Strangford, County Down, Northern Ireland (Irish Baile Loch Cuan, Contae an Dúin, Éire). Kilclief Castle is the oldest tower-house in the peninsula of Lecale (Irish Leath Cathail) and was built between 1412 and 1441.
Link: Killclief Castle and image courtesy of Discover Northern Ireland