In consequence of the desire you expressed for views and measurements of Ystumcegid, when we visited it together last August, I again repaired to the spot, and I now have the pleasure to forward you the result of my operations and inquiries. This cromlech, or in Welsh coetan, is situated about half a mile from the left bank of the river Dwyfawr, which winds considerably in this part of its course, and may probably have given rise to the name Ystumcegid or Ystumcuddiedig, meaning the windings of the hidden or concealed. The house which originally stood on this property is reported to have been the residence of Prince Owen Gwynneth in the eleventh century; but, having been burnt down during the wars of Owen Glendower, the present farm-house was erected shortly afterwards.