I don't know where this can refer to. Perhaps someone reading will know. The folklore is just what you'd expect for a prehistoric site.
Gentlemen - Some few years ago I was travelling on a coach between Chepstow and Abergavenny, when my attention was drawn to some large stones lying prostrate on the right hand side of the road, but on which side of the town of Usk I cannot now remember.
.. I found that in the eyes of the coachman, and also of the whole neighbourhood, they were considered rather as a lion, not on account of being Celtic remains, but because it had required the united force of the farm-horses of the neighbourhood to pull them down, and that they could not even then remove the disunited masses from the spot.
Thanks, Mr Richard GP Minty for your vagueness. Perhaps the stones have gone now anyway? But you never know, especially if they were that stubborn.
from 'Archaeologia Cambrensis' v II (1847), p 275.