Oswiu of Northumbria
After Bernicia united with Deira to become the kingdom of Northumbria, Rheged was annexed by Northumbria, some time before AD 730. There was a royal marriage between Prince (later King) Oswiu of Northumbria and the Rhegedian princess Rieinmelth, granddaughter of Rum (Rhun), probably in 638, so it is possible that it was a peaceful takeover, both kingdoms being inherited by the same man.