Brian Boru, the High King of Ireland, joined forces with other Irish kings to defend against a large Viking army led by Sitric, the Viking King of Dublin, and Maelmurra. On the eve of the Battle of Clontarf in 1014, Mael Sechnaill had a disagreement with Brian and refused to help. The next day, during the battle, the Irish forces led by Brian's son Murcadh initially struggled but gained the upper hand as the day went on. Mael Sechnaill then entered the battle, defeating the Vikings who fled back to their ships. However, Brian was killed in his tent by the Viking King Brodir of the Isle of Man as