In Treneglwys there is a certain shepherd's cot known by the name of
Twt y Cymrws because of the strange strife that occurred there. There
once lived there a man and his wife, and they had twins whom the woman
nursed tenderly. One day she was called away to the house of a
neighbour at some distance. She did not much like going and leaving her
little ones all alone in a solitary house, especially as she had heard
tell of the good folk haunting the neighbourhood.
Well, she went and came back as soon as she could, but on her way back
she was frightened to see some old elves of the blue petticoat crossing
her path though it was midday. She rushed home, but found her two
little ones in the cradle and everything seemed as it was before.
But after a time the good people began to suspect that something was
wrong, for the twins didn't grow at all.