Moel yr Eglwys

Or take the following, from J. H. Roberts' essay, as given in Welsh in Edwards' Cymru for 1897, p. 190: it reminds one of an ordinary fairy tale, but it is not quite like any other which I happen to know:--In the western end of the Arennig Fawr there is a cave: in fact there are several caves there, and some of them are very large too; but there is one to which the finger of tradition points as an ancient abode of the Tylwyth Teg. About two generations ago, the shepherds of that country used to be enchanted by one of them called Mary, who was remarkable for her beauty. Many an effort was made to catch her or to meet her face to face, but without success, as she was too quick on her feet. She used to show herself day after day, and she might be seen, with her little harp, climbing the bare slopes of the mountain. In misty weather when the days were longest in summer, the music she made used to be wafted by the breeze to the ears of the love-sick shepherds. Many a time had the boys of the Filltir Gerrig heard sweet singing when passing the cave in the full light of day, but they were subject to some spell, so that they never ventured to enter. But the shepherd of Boch y Rhaiadr had a better view of the fairies one Allhallows night (ryw noson Galangaeaf) when returning home from a merry-making at Amnodd. On the sward in front of the cave what should he see but scores of the Tylwyth Teg singing and dancing! He never saw another assembly in his life so fair, and great was the trouble he had to resist being drawn into their circles.