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This thirteenth century fortified manor house is supposedly the hiding place of a treasure chest full of gold, which was hidden by two giants. The legend says the treasure is guarded by a raven which sits atop the chest. The key to the chest was apparently lost when one of the giants dropped it in the moat. For a more in-depth account consider the article The Giants of Stokesay Castle.
Stokesay Castle was built by Lawrence Ludlow who was a successful wool merchant. Though referred to as a castle it is actually a fortified home, designed as a residence, not a military installation.
Having a raven guarding a hoard of treasure is also a common theme and found in many stories.