However, the earlier idea, that the heirs to the Scots throne ruled Strathclyde, or Cumbria as an appanage, has relatively little support, and the degree of Scots control should not be overstated.
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Edgar's will also granted David an appanage in "Cumbria" (the lands of the former Kingdom of Strathclyde), and perhaps also in southern parts of Lothian.
He defeated the Angles at Carham in 1018 and installed his grandson, Duncan, son of the Abbot of Dunkeld and his choice as Tanist, in Carlisle as King of Cumbria that same year.
The region also covered the rest of Cumbria during the late 1980s, complete with an opt-out television news service for the area, before it was transferred to the BBC North East region owing to high viewer demand.
Cumbria County Council were responsible for the management of Birdoswald fort from 1984 until the end of 2004, when English Heritage assumed responsibility.
In this period, the kingdom of Strathclyde may have extended far to the south, perhaps beyond the Solway Firth into modern English Cumbria, although this is far from certain.
The area was settled as early as 3000 BC, and offerings of that period imported from Cumbria and Wales left on the sacred hilltop at Cairnpapple Hill, West Lothian, show that by then there was a link with these areas.