Barclodiad-y-Gawres

Let us now come to the treasure caves, and begin with Ogof Arthur, 'Arthur's Cave,' in the southern side of Mynydd y Cnwc in the parish of Llangwyfan, on the south-westem coast of Anglesey. The foot of Mynydd y Cnwc is washed by the sea, and the mouth of the cave is closed by its waters at high tide, but the cave, which is spacious, has a vent-hole in the side of the mountain [*] . So it is at any rate reported in the Brython for 1859, p. 138, by a writer who explored the place, though not to the end of the mile which it is said to measure in length. He mentions a local tradition, that it contains various treasures, and that it temporarily afforded Arthur shelter in the course of his wars with the Gwyddelod or Goidels. But he describes also a cromlech on the top of Mynydd y Cnwc, around which there was a circle of stones, while within the latter there lies buried, it is believed, an iron chest full of ancient gold. Various attempts are said to have been made by the more greedy of the neighbouring inhabitants to dig it up, but they have always been frightened away by portents. Here then the guardians of the treasure are creatures of a supernatural kind...

[*] All said by natives of Anglesey about rivers and mountains in their island must be taken relatively, for though the country has a very uneven surface it has no real mountain: they are apt to call a brook a river and a hillock a mountain, though the majestic heights of Arfon are within sight.