..the building of Kits Coty House is attributed to the magical work of three witches who lived on Blue Bell Hill. Having raised the huge wall-stones, they found themselves unable to lift the capstones, and had to call in the assistance of a fourth member of the sisterhood, by whose help they were enabled to raise the immense stone into the air and lower it gently upon its walls.
From ‘Notes on the Folklore and Legends Associated with the Kentish Megaliths, by John H. Evans, in Folklore, Vol. 57, No. 1. (Mar., 1946), p. 39.