Driven out of Gwynedd by Hywel Dda when Idwal Foel died in 942, Iago and his brother, Ieuaf were restored when Hywel died in 950. Civil strife followed, ending in Ieuaf's defeat in 969 : in 979, Iago was in turn imprisoned by Ieuaf's son, Hywel ap Ieuaf, who thereupon became king of Gwynedd. Only Iago can be identified with reasonable confidence among the Welsh who, together with other vassal kings, submitted to Edgar, at Chester, in 973, an event which inspired the legend of Edgar's triumphal passage along the Dee. The date of his death is unknown. Pedigrees ascribe to him another son, Cystennin, who founded no family.
Published date: 1959
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