 Columba told Áed that he would be as great a king as his father—Adomnán calls Diarmait king of Ireland—only if he avoided kinslaying.If he killed a kinsman he would be king only of his own people and that for only a short time.According to some later king lists, Áed was jointly High King of Ireland with Colmán Rímid of the Cenél nEógain after the death of Áed mac Ainmuirech in 598.