According to the Vulgate Cycle, a knight reputedly descended from the Greek hero Heracles. He was killed by Arthur. In Malory, Ryons has the habit of trimming his cloak with the beards of his defeated enemies. He attempts to complete the project with Arthur's beard, but is instead slain by Arthur with the help of Balin and Balan.
- Lacy, Norris J., ed. (1996). The New Arthurian Encyclopedia. New York: Garland.