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Carrigafoyle Castle in Ballylongford, Co.Kerry, Ireland was built by Conor Liath O'Connor in the 1490s, and considered one of the strongest of Irish fortresses.
Its name is an anglicisation of the Irish, Carraig an Phoill ("rock of the hole").
The castle was referred to as the guardian of the Shannon, because of its strategic command of the shipping lanes that supplied the trading city of Limerick, some 20 miles (32 km) upriver.The tower-keep itself was 86 ft high.

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