In 600 Áed had his nephew, Suibne mac Colmáin Már, killed, "treacherously" says Adomnán. According to Marianus Scotus, Suibne, rather than Áed and Colmán Rímid, had been High King. In 604 both Áed and Colmán Rímid died by violence. Colmán was murdered by a kinsman and Suibne's son Conall Guthbinn killed Áed. This may have happened in battle and Áed may have been allied with the Uí Failgi, neighbours of Conall's. Áed and Colmán Rímid were followed as High King by Áed Uaridnach.