He was the grandson of the founder of this branch of the dynasty, Coirpre Luachra mac Cuirc.
A genealogical tract states that he succeeded his father Maine mac Coirpri in the stewardship of Iarmuman.
However he refused to pay his dues to Cashel and war broke out between him and his cousin, Óengus mac Nad Froích (died 489), the King of Munster.
[2] He is however not mentioned in the king lists nor the annals which give the succession to the sons of Óengus.
Some of his descendants such as his great-grandson Áed Bennán mac Crimthainn (died 618) may have been kings of all Munster.