Lled Croen yr Ych, ‘the Width of the Ox’s Hide’.
The tradition explanatory of this name is thus given by the late Mr. Richard Williams, F.R.hist.S.: “Once upon a time two ‘ychain bannawg’ (long-horned oxen) were separated, one being placed on the top of this mountain and the other on the top of the hill between Llanbrynmair and the Cemmes; that the two bellowed to each other until both died of grief because of their separation, and that the one which died here was skinned, and his skin spread out over the spot where he was buried, this circle of stones being set up to mark its dimensions” (’Hist. of the Parish of Llanbrynmair,‘ Mont. Coll., 1888, xxii, 308).
Quoted in An inventory of the ancient and historical monuments of the county of Montgomery (1911).