John De Courcy

Sir John de Courcy (c. 1150–1219) was an Anglo-Norman knight who lived in Ireland from 1176 until his expulsion in 1204. He conquered a considerable territory, endowed religious establishments, built abbeys for both the Benedictines and the Cistercians and built strongholds at Dundrum Castle in County Down and Carrickfergus Castle in County Antrim.