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Five hundred years ago, a major city occupied what is now a large and empty field in the Scottish Borders.
Founded by a king as a hub for international trade, Roxburgh was, along with Edinburgh, Stirling and Berwick, one of the four great centres of medieval Scotland.
But while the other three became thriving cities, Roxburgh simply vanished. There are plenty of documents but only a ruined castle remains as a clue to the town's layout.
It has lain untouched since its final decline in the 16th century - now Tony and the Team have a unique chance to uncover whatever remains under the pasture.
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