Weis' "Ancestral Roots. . ." (178:1). In 1063, CYNAN ap IAGO, king of Gwynedd and Powys, was killed. His rightful heir, GRUFFUDD was only 8 years old and living in Ireland with his mother. At that time Rhiwallon assumed control of the kingdom of Powys and his brother, BLEDDYN, assumed control of the kingdom of Gwynedd . Rhiwallon was killed in a skirmish
in 1070. At that time, apparently, Powys was again joined to Gwynedd.