Knightlow Hill — The Wroth Stone

The scheduled monument record (on Magic) describes the Wroth Stone as the remains of a medieval boundary cross base. The mound is described as medieval too, but “It has been suggested that the mound may have originated prior to the construction of the cross, perhaps as a burial tumulus which was later adapted as a base for the cross.” As the medieval English were not generally in the habit of building barrows, is this a half-admission of a prehistoric origin?