She is very carefully described by the Prophet Jones in the guise in which she haunted Lanhyddel Mountain in Monmouthshire. This was the semblance of a poor old woman, with an oblong four-cornered hat, ash-coloured clothes, her apron thrown across her shoulder, with a pot or wooden can in her hand, such as poor people carry to fetch milk with, always going before the spectator, and sometimes crying 'Wow up!' This is an English form of a Welsh cry of distress) ' Wwb!' or 'Ww-bwb! [Pronounced Wooboob]. Those who saw this apparition, whether by night or on a misty day, would be sure to lose their way, though they might be perfectly familiar with the road.
Sometimes they heard her cry, 'Wow up!' when they did not see her. Sometimes when they went out by night, to fetch coal, water, etc., the dwellers near that mountain would hear the cry very close to them, and immediately after they would hear it afar off, as if it were on the opposite mountain, in the parish of Aberystruth. The popular tradition in that district was that the Old Woman of the Mountain was the spirit of one Juan White, who lived time out of mind in those parts, and was thought to be a witch; because the mountains were not haunted in this manner until after Juan White's death. ['Juan (Shui) White is an old acquaintance of my boyhood,' writes to me a friend who was born some thirty years ago in Monmouthshire. ' A ruined cottage on the Lasgarn hill near Pontypool was understood by us boys to have been her house, and there she appeared at 12 p.m., carrying her head under her arm.']
When people first lost their way, and saw her before them, they used to hurry forward and try to catch her, supposing her to be a flesh-and-blood woman, who could set them right; but they never could overtake her, and she on her part never looked back; so that no man ever saw her face. She has also been seen in the Black Mountain in Breconshire. Robert Williams, of Langattock, Crickhowel, 'a substantial man and of undoubted veracity,' tells this tale As he was travelling one night over part of the Black Mountain, he saw the Old Woman, and at the same time found he had lost his way. Not knowing her to be a spectre he hallooed to her to stay for him, but receiving no answer thought she was deaf. He then hastened his steps, thinking to over take her, but the faster he ran the further he found himself behind her, at which he wondered very much, not knowing the reason of it. He presently found himself stumbling in a marsh, at which discovery his vexation increased and then he heard the Old Woman laughing at him with a weird, uncanny crackling old laugh. This set him to thinking she might he a gwyll; and when he happened to draw out his knife for some purpose, and the Old Woman vanished, then he was sure of it; for Welsh ghosts and fairies are afraid of a knife.
'For want of which care many were hurt by them.' While it was desirable to exorcise them when in the open air, it was not deemed prudent to display an inhospitable spirit towards any member of the fairy world. The cases of successful exorcism by knife are many, and nothing in the realm of faerie is better authenticated. There was Evan Thomas, who, travelling by night over Bedwellty Mountain, towards the valley of Ebwy Fawr, where his house and estate were, saw the Gwyllion on each side of him, some of them dancing around him in fantastic fashion. He also heard the sound of a bugle-horn winding in the air, and there seemed to be invisible hunters riding by. He then began to be afraid, but recollected his having heard that any person seeing Gwyllion may drive them away by drawing out a knife. So he drew out his knife, and the fairies vanished directly. Now Evan Thomas was 'an old gentleman of such strict veracity that he' on one occasion 'did confess a truth against himself,' when he was 'like to suffer loss' thereby, and notwithstanding he 'was persuaded by some not to do it, yet he would persist in telling the truth, to his own hurt.' Should we find, in tracing these notions back to their source that they are connected with Arthur's sword Excalibur? If so, there again we touch the primeval world. Jones says that the Old Woman of the Mountain has, since about 1800, (at least in South Wales,) been driven into close quarters by the light of the Gospel-in fact, that she now haunts mines-or in the preacher's formal words, 'the coal-pits and holes of the earth.'
Among the traditions of the origin of the Gwyllion one which associates them with goats. Goats are in Wales held in peculiar esteem for their supposed occult intellectual powers. They are believed to be on very good terms with the Tylwyth Teg, and possessed of more knowledge than their appearance indicates. It is one of the peculiarities of the Tylwyth Teg that every Friday night they comb the goats' beards to make them decent for Sunday. Their association with the Gwyllion is related in the legend of Cadwaladr's goat: Cadwaladr owned a very handsome goat, named Jenny, of which he was extremely fond; and which seemed equally fond of him; but one day, as if the very diawi possessed her, she ran away into the hills, with Cadwaladr tearing after her, half mad with anger and affright.
At last his Welsh blood got so hot, as the goat eluded him again and again, that he flung a stone at her, which knocked her over a precipice, and she fell bleating to her doom. Cadwaladr made his way to the foot of the crag; the goat was dying, but not dead, and licked his hand--which so affected the poor man that he burst into tears, and sitting on the ground took the goat's head on his arm. The moon rose, and still he sat there. Presently he found that the goat had become transformed to a beautiful young woman, whose brown eyes, as her head lay on his arm, looked into his in a very disturbing way. 'Ah, Cadwaladr,' said she, 'have I at last found you?' Now Cadwaladr had a wife at home, and was much discomfited by this singular circumstance; but when the goat--yn awr maiden--arose, and putting her black slipper on the end of a moonbeam, held out her hand to him, he put his hand in hers and went with her. As for the hand, though it looked so fair, it felt just like a hoof.
They were soon on the top of the highest mountain in Wales, and surrounded by a vapoury company of goats with shadowy horns. These raised a most unearthly bleating about his ears. One, which seemed to be the king, had a voice that sounded above the din as the castle bells of Carmarthen used to do long ago above all the other bells in the town. This one rushed at Cadwaladr and butting him in the stomach sent him toppling over a crag as he had sent his poor nannygoat. When he came to himself, after his fall, the morning sun was shining on him and the birds were singing over his head. But he saw no more of either his goat or the fairy she had turned into, from that time to his death.