Kelly’s Directory of Cornwall 1926
Davidstow
......On the Bodmin Moors, near the village is a group of barrows surrounded by well defined moat filled with water, and also a genuine long barrow measuring 170 ft long and 60 feet wide; the burial chamber is at the east end and there are the remains of a fine chromlech. The capstone is huge, 18ft by 7ft, and is composed of igneous rock not found nearer than a mile, so that prehistoric man must have dragged it at least that distance. There are 18 cup markings, a very rare feature, as there is only one other example in Cornwall, in the parish of St Keverne.