Claim: 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.
Label (1 = SUPPORTED, 0 = NOT_SUPPORTED, -1 = unlabeled): -1