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The Ruin, as it is called on the earliest OS maps, was built by Benjamin Ferrand and is inscribed with his initials and the year 1796. Also known as Ferrand’s Folly, or Harden Grange Folly, there is no explanation for why it later became known as St David’s Ruin. The Ruin was built as an eye-catcher on an outcrop of rock high up above the valley of the Harden Beck. The folly is now engulfed in woodland; but whilst it has lost its role as a distant object it is now very romantically situated in a small glade amongst pines. (source thefollyflaneuse.com)