Brian Boru was killed at Clontarf on Good Friday of 1014.
Mael Morda was also killed in action as the armies of the North achieved victory against the South and their Viking allies.
Well before having received the report of Jonathan Sanders, Brian Boru had imprisoned his ex-wife Gormlaith for conspiracy upon learning she had encouraged her brother Mael Morda and Dublin Viking leader Sigtrygg Silkbeard to join forces against him. King Brian led a series of raids against Viking sympathizers around Dublin, and in his absence Gormlaith sent word to both the Earl of Orkney and Brodir the Manx to join in the coming battle. Both Silkbeard and Boru had enlisted everyone who would fight for their cause, and the result was the bloodiest battle in Irish history.
It was estimated that over 6,000 Vi
