"... a certain wealthy man, whose mansion stood on the north side of
the mountains, of Presseli [Preseli Hills, Pembrokeshire, Wales], had
dreams for 3 successive nights, in which he was admonished that if he
went to a fountain in the neighbourhood, called St. Bernac’s well, and
put his hand down to the stone which lay over the spring, he would
draw out a collar of gold.
On the 3rd day the man did as he was bidden, and putting his hand into
the hole, a viper bit his finger, and he died in consequence."