According to the Harleian genealogies, he was the son of Elfin, one of his predecessors as king. The same genealogy makes him father to Teudebur, his probable successor on the throne. His obituary is noted in the Brut y Tywysogion and the Annals of Ulster under the year 722.
- MacQuarrie, Alan, "The Kings of Strathclyde", in A. Grant & K.Stringer (eds.) Medieval Scotland: Crown, Lordship and Community, Essays Presented to G.W.S. Barrow, (Edinburgh, 1993), pp. 1–19