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https://stairnaheireann.net/2016/04/23/1014-battle-of-clontarf-the-dublin-norse-and-the-king-of-leinster-with-viking-allies-from-overseas-are-defeated-by-brian-borus-army/
1014 – Battle of Clontarf: The Dublin Norse and the king of Leinster, with Viking allies from overseas, are defeated by Brian Boru’s army