Barnard Castle is a ruined medieval castle situated in the town of the same name in County Durham. It is a Scheduled Ancient Monument, and was designated as a Grade I listed building in 1950. The remains of the medieval chapel of St Margaret in the outer ward are listed as Grade II.
A stone castle was built on the site of an earlier defended position from around 1095 to 1125 by Guy de Balliol. Between 1125 and 1185 his nephew Bernard de Balliol and his son Bernard II extended the building.
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