[1] Kistvaens have been found in many places, including Dartmoor, a 954 km2 (368 square miles) area of moorland in south Devon, England.

The box-like stone tombs were created when the ancient people of the area lived in hut circles.

Cists are often to be found in the centre of a cairn circle although some appear solitary which could be the result of the loss of an original slight mound.

[7] In August 2011 an untouched cist, on Whitehorse Hill, near Chagford, was the first to be excavated on the moor for over 100 years.

[8] This burial yielded some rare Bronze Age artefacts made of organic materials.

The idea that ancient tombs might contain valuable items is a very old one; one of the first mentions of searching tumuli in Devon dates back to 1324.

However the various treasure-related common names for these burial sites caused some people to break the taboo that tombs must be revered and not disturbed.

As a result of this tomb-raiding, stories came into being which purport to show that a graverobber's inappropriate and greedy actions will be punished in supernatural ways.

Either way, the story says he made a map of all of the nearby kistvaens, showing the locations as black dots.

Eventually the farmer put his hand inside, and pulled out a small piece of flint, shaped in the form of a heart.