Who was Canthrig Bwt?

Google translate of version by Dafydd Whiteside-Thomas (Chwedlau a Choelion Godre’r Wyddfa, 1998)

“In the Llanberis pass, close to the cliffs of Mur Mawr,  and not far from Ynys Ettws, there is a mass of huge rocks known as Creigiau’r Gromlech (the Cromlech Boulders). Here, many years ago, lived a witch or giantess called Canthrig Bwt. Everyone in the area knew her and kept clear of her, especially the children who would run in terror every time she appeared.

The children of some of the families in the area began to disappear and it was thought at first that some wild animals attacked them and carried them back as prey to the mountains. In time, a dog owned by one of the Cwmglas sons came across a piece of skeleton close to the Cromlech Boulders. It was soon realised that the piece that the dog carried back was a child’s hand. After studying it in detail it was realised that it was the hand of one of the children who had disappeared. It was possible to identify her because that child had a special wound on her fingers.

They started watching Canthrig and the Nant families decided that she had to be killed. One of the bravest men in the area went to the rocks and shouted at Canthrig saying that he had the gift of a young child for her. She replied that she would come out of hiding as soon as she had finished eating the head of the last child she had killed. Before long, she came out of her hiding place under the stones and was rushed by a group of men.

They managed to catch her by the arm and her head was cut off with a sickle.

It is said that she was buried in a place near Tir Coch, near Llanberis. Ever after that, the children of the area had peace.”