Brian Boru enacted vengeance on the last of the Ímair dynasty of Limerick for the treacherous slaying of his older brother and king of Munster, Mahon. This happened at this spot on Scattery Island in the River Shannon almost 1,050 years ago. This began Brian's trajectory to high kingship. Although a breaking of church law and sanctity by entering the monastery to dispatch Ivar and his sons, it would be his last such act, and a sign of his feelings for his brother and what happened to him. After