Harleian genealogy of the Kings of Alt Clut, here.
Annales Cambriae, s.a. 870, here; Annali dell'Ulster, s.a. 870.6, here. Alan MacQuarrie, "The Kings of Strathclyde", in A. Grant & K.Stringer (eds.) Medieval Scotland: Crown, Lordship and Community, Essays Presented to G.W.S. Barrow, (Edimburgo, 1993), pp. 12-13.
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Annales Cambriae, s.a. 870, here; Annali dell'Ulster, s.a. 870.6, here. Alan MacQuarrie, "The Kings of Strathclyde", in A. Grant & K.Stringer (eds.) Medieval Scotland: Crown, Lordship and Community, Essays Presented to G.W.S. Barrow, (Edimburgo, 1993), pp. 12-13.