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See more Rhydderch ap IestynRhydderch ap Iestyn (d. 1033) Rhydderch ab Iestyn King in south Wales, who after Llywelyn ap Seisyll’s death (1023), began to expand his power, became king of Deheubarth, apparently by seizing the kingdom, and later proclaimed himself king of south Wales. According to an entry in Brut y tywysogion, he was slain by the Irish. See more
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