rhiwallon ap cynfyn, was a welsh king and following the 1063 invasion of powys by harold and tostig godwinson, he was an anglo-saxon earl of northumbria which jointly overthrew gruffydd, rhiwallon and bleddyn.
rhiwallon ap cynfyn, was a welsh king and following the 1063 invasion of powys by harold and tostig godwinson, he was an anglo-saxon earl of northumbria which jointly overthrew gruffydd, rhiwallon and bleddyn.
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