The Cat Sidhe (or Cait Sidhe, or Cat Sith, or Cat Si) is a Celtic fairy cat. It is always portrayed as a black cat with a white spot on its chest. Some tales hold that Cat Sidhe are witches who are able to turn from humans to cats, others that the Cat Sidhe can steal the souls of the dead. It’s also said that a bowl of milk left for the Cat Sidhe on Samhain will lead it to bless that household. This image draws on the tale of the King of the Cats, which tells of a Cat Sidhe who ruled over all cats.