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The Mac-I-Briens, a Egans, in the barony of Arra, were hereditary Brehons of Ormond; branch of the O'Briens of Thomond, descendedfrom Brian Roe
Q'Brien, king of Thomond, had large possessionsin the barony of Owney and Arra, in Tipperary, and in the barony of Coonagh, county of Limerick.