Barry "wept bitterly, and uttered a prophecy concerning the future fate of the murderers;" a prophecy which was very speedily fulfilled. This was in the year 976, three or four years before the battle of Tara and the accession of Malachy. When the news of his noble-hearted brother's murder was brought to Brian, at Kinkora, he was seized with the most violent grief. His favourite harp was taken down, and he sang the death-song of Mahon, recounting all the glorious actions of his life. His anger flashed out through his tears, as he wildly chanted "My heart shall burst within my breast, Unless I avenge this great king; They shall forfeit life for this foul deed Or I must perish by a violent death." But the climax of his lament was, that Mahon "had not fallen in battle behind the shelter of his shield, rather than trust in the treacherous words of Donovan." Brian was now in his thirty-fifth year, was married, and had several children. Morrogh, his eldest, was able to bear arms, and shared in his ardour and ambition. "His first effort," says an old Chronicle, "was directed against Donovan's allies, the Danes of Limerick, and he slew Ivar their king, and two of his sons." These conspirators, foreseeing their fate, had retired into the holy isle of Scattery, but Brian slew them between "the horns of the altar." For this violation of the sanctuary, considering his provocation, he was little blamed. He next turned his rage against Donovan, who had called to his aid the Danish townsmen of Desmond. "Brian," says the Annalist of Innisfallen, "gave them battle where Auliffe and his Danes, and Donovan and his Irish forces, were all cut off." After that battle, Brian sent a challenge to Molloy, of Desmond, according to the custom of that age, to meet him in arms near Macroom, where the usual coalition, Danes and Irish, were against him. He completely routed the enemy, and his son Morrogh, then but a lad, "killed the murderer of his uncle Mahon with his own hand." Molloy was buried on the north side of the mountain where Mahon was murdered and interred; on Mahon the southward sun shone full and fair; but on the grave of his assassin, the black shadow of the northern sky rested always. Such was the tradition which all Munster piously believed. After this victory over Molloy, son of Bran (A.D. 978), Brian was universally acknowledged King of Munster, and until Malachy had won the battle of Tara, was justly considered the first Irish captain of his age.