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MCSWEENY Family HistoryClan Sweeney is an Irish clan of Scottish origin. The clan did not permanently settle in Ireland before the beginning of the fourteenth century, when they became Gallowglass soldiers for the O'Donnell dynasty of Tyrconnell. The clan claims an Irish ancestry, from ?nroth?n, son of ?ed, son of Flaithbertach ? N?ill, king of Cen?l nE?gain who died in 1036. Through this descent the clan can also claim a descent from Niall Noig?allach (Niall of the Nine Hostages).
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