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Phillimore 1888:166, cites the Annales Cambriae — year 877, "Rotri et filius eiu...
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Phillimore 1888:166, cites the Annales Cambriae — year 877, "Rotri et filius eius guriat a saxonibus iugulatur." Cited by Wikipedia: Merfyn_Frych Accessed 6/25/2019 jhd