Mallt-y-Nos , also known as the Night Mallt, is a crone

Crone

The crone is a stock character in folklore and fairy tale, an old woman who is usually disagreeable, malicious, or sinister in manner, often with magical or supernatural associations that can make her either helpful or obstructing. She is marginalized by her exclusion from the reproductive cycle,...

 in Welsh mythology

Welsh mythology

Welsh mythology, the remnants of the mythology of the pre-Christian Britons, has come down to us in much altered form in medieval Welsh manuscripts such as the Red Book of Hergest, the White Book of Rhydderch, the Book of Aneirin and the Book of Taliesin....

 who rides with Arawn

Arawn

In Welsh mythology, Arawn was the king of the otherworld realm of Annwn, appearing prominently in the first branch, and alluded to in the fourth. In later tradition, the role of king of Annwn was largely attributed to the Welsh psychopomp, Gwyn ap Nudd...

 and the hound

Hound

A hound is a type of dog that assists hunters by tracking or chasing the animal being hunted. It can be contrasted with the gun dog, which assists hunters by identifying the location of prey, and with the retriever, which recovers shot quarry...

s (Cŵn Annwn

Cwn Annwn

In Welsh mythology and folklore, Cŵn Annwn were the spectral hounds of Annwn, the otherworld of Welsh myth. They were associated with a form of the Wild Hunt, presided over by Gwynn ap Nudd...

) of the Wild Hunt

Wild Hunt

The Wild Hunt is an ancient folk myth prevalent across Northern, Western and Central Europe. The fundamental premise in all instances is the same: a phantasmal, spectral group of huntsmen with the accoutrements of hunting, horses, hounds, etc., in mad pursuit across the skies or along the ground,...

, chasing sorrowful, lost souls to Annwn

Annwn

Annwn or Annwfn was the Otherworld in Welsh mythology. Ruled by Arawn, or much later by Gwyn ap Nudd, it was essentially a world of delights and eternal youth where disease is absent and food is ever-abundant. It later became Christianised and identified with the land of souls that had departed...

. The Mallt-y-Nos drives the hounds onward with shrieks and wails, which some say are evil and malicious in nature.

Others say that she was once a beautiful but impious Norman

Normans

The Normans were the people who gave their name to Normandy, a region in northern France. They were descended from Norse Viking conquerors of the territory and the native population of Frankish and Gallo-Roman stock...

noblewoman who loved hunting so much that she said, "If there is no hunting in heaven, I would rather not go!" She is said to have regretted making this wish, and now cries out
in misery rather than joy as she hunts forever in the night sky.