From the National monuments Database:
Named ‘site of caher’ on the 1837 OS 6-inch map, this site has been referred to as ‘Dun Griffen’ (Shearman 1893, 451). The cashel, which had been erected at the eastern end of the headland, was removed during construction of the Baily lighthouse. Large quantities of bones were revealed. In 1890 when the Board of Irish Lights erected some cottages on the ‘Little Bailey’ several weapons of uncertain date were discovered in the digging of foundations. Not visible at ground level.
Compiled by: Geraldine Stout