The death portent called Cwn Annwn, or Dogs of Hell, is a pack of hounds which howl through the air with a voice frightfully disproportionate to their size, full of a wild sort of lamentation. There is a tradition that one of them once fell on a tombstone, but no one was able to secure it. A peculiarity of these creatures is that the nearer they are to a man the less loud their voice sounds, resembling then the voice of small beagles, and the farther off they are the louder is their cry. Sometimes a voice like that of a great hound is heard sounding among them--a deep hollow voice, as if it were the voice of a monstrous bloodhound. Although terrible to hear, and certain portents of death, they are in themselves harmless. 'They have never been known,' says a most respectable authority,[103] 'to commit any mischief on the persons of either man or woman, goat, sheep, or cow.' Sometimes they are called Cwn y Wybr, or Dogs of the Sky, but the more sulphurous name is the favourite one. They are also sometimes called Dogs of the Fairies. Their origin in fairyland is traced to the famous mabinogi of Pwyll, Prince of Dyfed; but in that fascinating tale of enchantment their right to be called Cwn Annwn is clearly set forth, for they are there the hounds of a King of Annwn. There are several translations of this mabinogi in existence, and its popularity in South Wales is great, for the villages, vales, and streams mentioned in it are familiar to residents in Pembroke, Carmarthen, and Cardigan shires. Pwyll, the Prince, was at Narberth, where was his chief palace, when he went one day to a wood in Glyn Cych. Here 'he sounded his horn and began to enter upon the chase, following his dogs and separating from his companions. And as he was listening to the cry of his pack, he could distinctly hear the cry of another pack, different from that of his own, and which was coming in an opposite direction. He could also discern an opening in the woods towards a level plain; and as his pack was entering the skirt of the opening he perceived a stag before the other pack, and about the middle of the glade the pack in the rear coming up and throwing the stag on the ground. Upon this he fixed his attention on the colour of the pack, without recollecting to look at the stag: and of all the hounds in the world he had ever seen he never saw any like them in colour. Their colour was a shining clear white, with red ears; and the whiteness of the dogs and the redness of their ears were equally conspicuous.'[104] They were the hounds of Arawn, a crowned king in the land of Annwn, the shadow-land of Hades.