 The kingdoms of Gwynedd, Powys, Dyfed and Seisyllwg, Morgannwg and Gwent emerged as independent Welsh successor states.Archaeological evidence, in the Low Countries and what was to become England, shows early Anglo-Saxon migration to Great Britain reversed between 500 and 550, which concurs with Frankish chronicles.John Davies notes this as consistent with the British victory at Badon Hill, attributed to Arthur by Nennius.