[A tradition is] connected with that remarkable line of tall stones near Fishguard marked on the ordnance map as Parc y Marw, or field of the dead, to avoid which the peasants after night make an enormous detour to the left as one goes through Newport.. the story of the Lady in White haunting these mysterious relics, although firmly believed, may be a comparatively later addition to an earlier superstition.
From Proc. Som. Arch. Soc. 1875 (v21).