Aideen’s Grave is a portal tomb. Aideen was said to be the wife of Oscar, who died at the battle of Gabhra. When Aideen learnt of Oscar’s death, she collapsed and died of her grief. Oisin, Oscar’s father had her buried at Howth and erected the portal tomb in her memory, for her loyalty. Such burials were normally reserved for great warriors or kings. The tomb is partially collapsed, with the capstone fallen backwards, but the portal stones still stand.