SOURCE-07063Research NeededProbable
Thornton, David E. (2004), "Merfyn Frych] (d. 844)", Oxford Dictionary of Nation...
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Thornton, David E. (2004), "Merfyn Frych] (d. 844)", Oxford Dictionary of National Biography, Oxford University Press. Cited by Wikipedia: Merfyn_Frych Accessed 6/25/2019 jhd