 Meanwhile , Brian , now in his seventies , had been advised to await the outcome of the battle in a tent not far from the field , and it is said that a traitor in the Irish camp , possibly Tadhg O <unk> , King of Uí Maine , had pointed out Brian 's position to Bróðir at some point during the battle . Accounts differ over whether Bróðir was the killer of Brian Boru . According to one Irish account , Bróðir overcame Brian 's guard , only to be killed by the High King who then killed himself . Njal 's saga records that Bróðir killed Brian and cried out : " Now let man tell man that Brodir felled Brian . " Two of Brian 's followers , Wolf and Kerthialfad , returned to the king , and captured Bróðir and the remainder of his men . According to the saga , " Wolf the Quarrelsome cut open his belly , and led him round and round the trunk of a tree , and so wound all his entrails out of him , " while Bróðir 's men were " slain to a man " . The modern Irish medievalist historian Donnchadh Ó Corráin , however , merely states that Bróðir was killed on the day of the battle and that Brian was killed in his tent " by Norsemen fleeing from the scene " . 
