This was the first time a ruler of Gwynedd had accepted the supremacy of an English king, and formed the basis for the homage which was demanded by the English crown from then on. By becoming the ruler of Powys, his mother's land, he inherited the old struggle between that kingdom and Mercia.
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He married Nest of the house of Powys, and their son, Rhodri, married Angharad of the house of Seisyllwg (Ceredigion and Ystrad Tywi).
Rhodri became ruler of Gwynedd in 844 on the death of his father, of Powys in 855 on the death of his uncle, Cyngen, and of Seisyllwg in 871 on the death of his brother-in-law, Gwgon; he died in 878, king of a realm extending from Anglesey to Gower."A later generation of chroniclers hailed Rhodri ap Merfyn as Rhodri Mawr (Rhodri the Great), a distinction bestowed upon two other rulers in the same century--Charles the Great (Charlemagne, died 814) and Alfred the Great (died 899).
Death Notes: Killed in a battle against the English (Saxons) in 878.
Research Notes: King of Gwynedd and Powys and Seisyllwg From A History of Wales, pp.