Ffynnon Gybi, or St. Cybi's Well, in the parish of Llangybi [..] there the girls who wished to know their lover's intentions would spread their pocket-handkerchiefs on the water of the well, and, if the water pushed the handkerchiefs to the south - in Welsh i'r de - they knew that everything was right - in Welsh o dde - and that their lovers were honest and honourable in their intentions; but, if the water shifted the handkerchiefs northwards, they concluded the contrary. A reference to this is made in severe terms by a modern Welsh poet, as follows:-

Ambell ddyn, gwaelddyn, a gyrch
I bant goris Moel Bentyrch,
Mewn gobaith mai hen Gybi
Glodfawr sydd yn llwyddaw'r lli.

Some folks, worthless folks, visit
A hollow below Moel Bentyrch,
In hopes that ancient Kybi
Of noble fame blesses the flood.

When I was staying at Pwlltheli the same summer, I went out to the neighbouring village of Four Crosses, and found a native of the place, who had heard a great many curious things from his mother. His name was Lewis Jones: he was at the time over eighty, and he had formerly been a saddler. Among other things, his mother often told him that her grandmother had frequently been with the fairies, when the latter was a child. She lived at Plas Du, and once she happened to be up near Carn Bentyrch when she saw them. She found them resembling little children, and playing in a brook that she had to cross. She was so delighted with them, and stayed so long with them, that a search was made for her, when she was found in the company of the fairies.