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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.