The mound is the result of the devil scraping his spade after he’d dug his ‘Devil’s Ditches’ in the locality. If you walk round the hill seven times at midnight you’ll get to meet him. A hollow in the hill is known as ‘the Devil’s Hole’.
There are also said to be golden or silver bells buried in the mound.
(J+C Bord, ‘Atlas of Magical Britain’)