The close resemblance of this goblin to the Irish banshee (or benshi) will be at once perceived. The same superstition is found among other peoples of Celtic origin. Sir Walter Scott mentions it among the highlands of Scotland.[96] It is not traced among other than Celtic peoples distinctly, but its association with the primeval mythology is doubtless to be found in the same direction with many other death-omens, to wit, the path of the wind-god Hermes.
The frightful ugliness of the Gwrach y Rhibyn is a consistent feature of the superstition, in both its forms; it recalls the Black Maiden who came to Caerleon and liberated Peredur:[97] 'Blacker were her face and her two hands than the blackest iron covered with pitch; and her hue was not more frightful than her form. High cheeks had she, and a face lengthened downwards, and a short nose with distended nostrils. And one eye was of a piercing mottled gray, and the other was as black as jet, deep-sunk in her head. And her teeth were long and yellow, more yellow were they than the flower of the broom. And her stomach rose from the breast-bone, higher than her chin. And her back was in the shape of a crook, and her legs were large and bony. And her figure was very thin and spare, except her feet and legs, which were of huge size.' The Welsh word 'gwrach' means a hag or witch, and it has been fancied that there is a connection between this word and the mythical Avagddu,[98] whose wife the gwrach was.
The Gwrach y Rhibyn appears also as a river-spectre, in Glamorganshire.
[98] Avagddu means both hell and the devil, as our word Heaven means both the Deity and his abode.
A death-portent which is often confused with the Gwrach y Rhibyn, yet which is rendered quite distinct by its special attributes, is the Cyhyraeth. This is a groaning spirit. It is never seen, but the noise it makes is no less terrible to the ear than the appearance of its visible sister is to the eye. Among groaning spirits it is considered to be the chief. The Prophet Jones succinctly characterises it as 'a doleful, dreadful noise in the night, before a burying.' David Prosser, of Llanybyther parish, 'a sober, sensible man and careful to tell the truth,' once heard the Cyhyraeth in the early part of the night, his wife and maid-servant being together in the house, and also hearing it; and when it came opposite the window, it 'pronounced these strange words, of no signification that we know of,' viz. '_Woolach! Woolach!_' Some time afterward a funeral passed that way. The judicious Joshua Coslet, who lived by the river Towy in Carmarthenshire, testified that the Cyhyraeth is often heard there, and that it is 'a doleful, disagreeable sound heard before the deaths of many, and most apt to be heard before foul weather. The voice resembles the groaning of sick persons who are to die; heard at first at a distance, then comes nearer, and the last near at hand; so that it is a threefold warning of death. It begins strong, and louder than a sick man can make; the second cry is lower, but not less doleful, but rather more so; the third yet lower, and soft, like the groaning of a sick man almost spent and dying.' A person 'well remembering the voice' and coming to the sick man's bed, 'shall hear his groans exactly like' those which he had before heard from the Cyhyraeth. This crying spirit especially affected the twelve parishes in the hundred of Inis Cenin, which lie on the south-east side of the river Towy, 'where some time past it groaned before the death of every person who lived that side of the country.' It also sounded before the death of persons 'who were born in these parishes, but died elsewhere.' Sometimes the voice is heard long before death, but not longer than three quarters of a year. So common was it in the district named, that among the people there a familiar form of reproach to any one making a disagreeable noise, or 'children crying or groaning unreasonable,' was to ejaculate, 'Oh 'r Cyhyraeth!' A reason why the Cyhyraeth was more often heard in the hundred of Inis Cenin was thought to be that Non, the mother of St. David, lived in those parts, where a village is called after her name, Llan-non, the church of Non.