Llyn Barfog is the scene of the famous elfin cow's descent upon earth, from among the droves of the Gwragedd Annwn. This is the legend of the origin of the Welsh black cattle, as related to me in Carmarthenshire: In times of old there was a band of elfin ladies who used to haunt the neighbourhood of Llyn Barfog, a lake among the hills just back of Aberdovey. It was their habit to make their appearance at dusk clad all in green, accompanied by their milk-white hounds. Besides their hounds, the green ladies of Llyn Barfog were peculiar in the possession of droves of beautiful milk-white kine, called Gwartheg y Llyn, or kine of the lake. One day an old farmer, who lived near Dyssyrnant, had the good luck to catch one of these mystic cows, which had fallen in love with the cattle of his herd. From that day the farmer's fortune was made. Such calves, such milk, such butter and cheese, as came from the milk-white cow never had been seen in Wales before, nor ever will be seen again. The fame of the Fuwch Gyfeiliorn (which was what they called the cow) spread through the country round. The farmer, who had been poor, became rich; the owner of vast herds, like the patriarchs of old. But one day he took it into his silly noddle that the elfin cow was getting old, and that he had better fatten her for the market. His nefarious purpose thrived amazingly. Never, since beef steaks were invented, was seen such a fat cow as this cow grew to be. Killing day came, and the neighbours arrived from all about to witness the taking-off of this monstrously fat beast. The farmer had already counted up the gains from the sale of her, and the butcher had bared his red right arm. The cow was tethered, regardless of her mournful lowing and her pleading eyes; the butcher raised his bludgeon and struck fair and hard between the eyes--when lo! a shriek resounded through the air, awakening the echoes of the hills, as the butcher's bludgeon went through the goblin head of the elfin cow, and knocked over nine adjoining men, while the butcher himself went frantically whirling around trying to catch hold of something permanent. Then the astonished assemblage beheld a green lady standing on a crag high up over the lake, and crying with a loud voice: