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It is likely that Causantín's (Constantine I) reign witnessed increased activity by Vikings, based in Ireland, in Northumbria and in northern Britain. He died fighting one such invasion. Viking armies were led by a small group of men who may have been kinsmen. Among those noted by the Irish annals, the Chronicle of the Kings of Alba and the Anglo-Saxon Chronicle are Ívarr—Ímar in Irish sources—who was active from East Anglia to Ireland, Halfdán—Albdann in Irish, Healfdene in Old English— and Amlaíb or Óláfr. As well as these leaders, various others related to them appear in the surviving record.
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