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.
Houbo un matrimonio real entre o príncipe (e despois rei) Oswiu de Northumbria e unha princesa de Rheged, probabelmente o 638, de xeito que é posíbel que houbese unha absorción pacífica xa que o mesmo home herdou ambos reinos.