Rhufoniog was the name given to the small sub-kingdom of Gwynedd
ruled by one of the sons of Cunedda Wledig. Although it is doubtful that the territory remained a
sub-kingdom under Maelgwyn Gwynedd's overlordship, Rhwfon's immediate descendants still
enjoyed some degree of power in this eastern territory. They quite possibly acted as
protectors of the eastern border, once Powys had gained
former Gwyneddian land (modern Clwyd) the east.