Rhodri Mawr (Rhodri the Great), King of Gwynedd, won an internationally celebrated victory over a Danish fleet raiding Anglesey, killing their leader Gorm. The victory was reported to Charles the Bald of Francia, who sent congratulations — the first recorded act of diplomacy between Wales and a continental ruler. Rhodri had united Gwynedd, Powys and Seisyllwg under one rule. His defeat of Gorm made him the most famous Welsh king of the Dark Ages. The location was Anglesey, the island most exposed to Norse attack from Ireland.
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