Kingdom of Strathclyde
The principal Roman stronghold in the area was at Vanduara (Paisley). Following the end of Roman rule in Britain in 410, the Cumbrian Britons, with their capital at Dumbarton, retained a hold on all the territory west of the Lothian — the Kingdom of Strathclyde. During the High Middle Ages, Strathclyde was conquered by the Kingdom of Alba, which in turn developed into the Kingdom of Scotland.