Gwrvan Gwallt Avwyn
Gwrvan Gwallt-avwy is a character who appears in the Mabinogion, and is thought, by some, to be the origin of the Arthurian knight Sir Gawain.
A Welsh Arthurian warrior named Gwrvan may be the origin to Gorvain Cadrut.
The Name Gwrvan Gwallt Avwyn can most likely be equated with that of Gware Gwallt Eurin, which also is mention in the court list in Culhwch. Both of the names most likely refer to Gwri Gwallt Euryn who Gruffydd associates with Gweir, the prisoner of Preiddeu Annwn.