A Demon Assuming the Form of a Horse
Sir John Williams, Bart, now of Aberystwyth, informed me that when a boy in the neighbourhood of Gwynfi, Carmarthenshire, he often heard some of the old people speak of a ghost which haunted the road in that part of the country in former times. This ghost was known as “Bwci,” and always assumed the form of a horse. It is an old belief of the Celts that demons assumed the form of horses, and one of these mythic beings was the Water Horse, so well-known in North Scotland. It was also known in Wales once.