Cat-sìth

The cat-sìth (, plural cait-shìth), in Irish cat sí, is a fairy creature from Celtic mythology, said to resemble a large black cat with a white spot on its chest. Legend has it that the spectral cat haunts the Scottish Highlands. The legends surrounding this creature are more common in Scottish folklore, but a few occur in Irish. Some common folklore suggested that the cat-sìth was not a fairy, but a witch that could transform into a cat nine times.

The cat-sìth may have been inspired by the Scottish wildcat itself. It is possible that the legends of the cat-sìth were inspired by Kellas cats, which are a distinctive hybrid between Scottish wildcats and domestic cats found only in Scotland (the Scottish wildcat is a population of the European wildcat, which is now absent from elsewhere in the British Isles).

Appearance
The cat-sìth is all black with the exception of a white spot on its chest. It is described as being as large as a dog and chooses to display itself with its back arched and bristles erect.

The King of the Cats
In the British folk tale "The King of the Cats", a man comes home to tell his wife and cat, Old Tom, that he saw nine black cats with white spots on their chests carrying a coffin with a crown on it and one of the cats tells the man to "Tell Tom Tildrum that Tim Toldrum is dead." Old Tom then exclaims, "What?! Old Tim dead! Then I'm the King o' the Cats!" The cat then climbs up the chimney and is never seen again.

Soul-stealing
The people of the Scottish Highlands did not trust the cat-sìth. They believed that it could steal a person's soul, before it was claimed by the gods, by passing over a corpse before burial; therefore, watches called the Fèill Fhadalach ('late wake') were performed night and day to keep the cat-sìth away from a corpse before burial. Methods of "distraction" such as games of leaping and wrestling, catnip, riddles and music would be employed to keep the cat-sìth away from the room in which the corpse lay. In addition, there were no fires where the body lay, as it was said that the cat-sìth was attracted to the warmth.

Samhain
On Samhain, it was believed that a cat-sìth would bless any house that left a saucer of milk out for it to drink and those houses that did not put out a saucer of milk would be cursed into having all of their cows' udders go dry.

Summoning
The demonic cat-sìth called Big Ears could be summoned (Gaelic taghairm ) to appear and grant any wish to those who took part in the ceremony. The ceremony required practitioners to burn the bodies of cats over the course of four days and nights.

Transformation
Some people believed that the cat-sìth was a witch that could transform voluntarily into its cat form and back nine times. If one of these witches chose to go back into their cat form for the ninth time, they would remain a cat for the rest of their lives. It is believed by some that this is how the idea of a cat having nine lives originated.