An Ulster chieftain surnamed "of the Poisoned Tongue," mentioned in the myth of Cuchulain, a medieval Irish romance. It is said that on one occasion he asked certain warriors to a feast and raised the question which of them was the greatest. Conall, Laery, and Cuchulain were selected, and a demon called "The Terrible" was requested to decide the point. He suggested that whoever could cut off his (The Terrible's) head today, and allow his own head to be cut off on the following day would be the most courageous, and therefore must deserve the title of champion. Cuchulain succeeded in beheading the devil, who immediately picked up his head and vanished. The next day he reappeared in his usual form in order to cut off Cuchulain's head. On his placing his head on the block, the demon told him to rise, and acknowledged that he was champion of Ireland.
"Briccriu." Encyclopedia of Occultism and Parapsychology. . Encyclopedia.com. (February 24, 2018). http://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/briccriu
"Briccriu." Encyclopedia of Occultism and Parapsychology. . Retrieved February 24, 2018 from Encyclopedia.com: http://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/briccriu