Dilston Castle is a ruined 15th-century tower house built by Sir William Claxton on the site of an earlier pele tower. It is a Scheduled Ancient Monument and Grade I listed building, but is NOT open to the public.
The castle is reputedly haunted by two apparitions. In life they were James Radcliffe, the Earl of Derwentwater and his wife. The Earl was beheaded on Tower Hill in 1716 for his part in the Jacobite Rebellion. He is said to have only joined following his wife sneering at his lack of gallantry. His subsequent death left her filled with remorse.
James rides the area around the castle whilst his wife walks the ruins, wringing her hands.
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For further information, please read Britain's Haunted Heritage by J.A. Brooks and Haunted Britain by Antony D. Hippisley Coxe.