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MacCarthy mor Castle

History of the MacCarthy mor Castle McCarthy MOR CASTLE is situated on the eastern shore of Loch Lein or the lower lake and gives its name to that portion known as the Bay of Castlelough. In early times this district was known as Eoghanacht Loch Lein. The families who ruled there, were descended from a common ancestor, Eoghan or Owen. Their descendants to-day are known by the family names of McCarthy, O'Sullivan, O'Mahony, O'Keeffe, O'Donovan and O'Donoghue.