Rhita Gawr
A Welsh giant who killed a number of kings and wore their beards as a trophy. He was killed by Arthur, and Arthur commanded his men to place stones over the giant's body, thus forming Gwyddfa Rhita ("Rhita's Cairn," an archaic Welsh term for Snowdon).
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References
Source
- MacKillop, James. (2004). Dictionary of Celtic Mythology. New York: Oxford University Press, Inc.