This is a bronze age round barrow but the legend associated with it is based on it's use as a place of execution in 1736. A local woodsman named Michael Morrey was executed at this spot for the murder of his own grandson, over some money that he had inherited. He tried to disguise the murder by carrying the corpse back to his cottage and setting fire to it.
He was hanged on the barrow and his dessicated corpse was displayed there on the gibbet for many years. A few people say that the when the remains were finally taken down they were buried in the barrow. It is said that his ghost rides around the barrow three times at midnight calling out "Michael Morrey's hump" in a wail.
A local pub close by, the Hare and Hound still has a beam said to be part of the gibbet on display and a grisly skull is said to be that of Michael himself.