This giant cat features in several early Welsh poems, and the name translates as Palug's cat. It is also known as 'the cat with sharp claws' or 'the cat that scratches.'
A medieval French story tradition tells how a cat called Chapalu or Chatloup (a corruption of Cath Palug) pushed King Arthur into a bog and then overcame him in battle, passing through Britain to conquer it, wearing the crown of Britain. This tale may relate to the early medieval stories of the conflict between King Arthur and Mordred (or Medrawt), in which Mordred's symbol is the cat.Not the sort of kitty one would want to nurse on one's lap in front of the fire of an evening!
If you'd like to listen to a book rather than read it,there are some really great books available in audio.
Children of the Mist: https://freeaudiobookcodes.com/?q=children+of+the+mist