Analysis of information sources in references of the Wikipedia article "Rheged" in English language version.
Several of the other genetic clusters show similar locations to the tribal groupings and kingdoms around at the time of the Saxon invasion (from the 5th century), suggesting that these tribes and kingdoms may have maintained a regional identity for many centuries. For example the Cumbrian cluster corresponds well to the kingdom of Rheged, West Yorkshire to the Elmet and Northumbria to the Bernicia. The existence of these largely quite well separated clusters suggests a remarkable stability of the British people over quite long periods of time.
