In Welsh mythology, Gwythyr ap Greidawl was a rival of Gwyn ap Nudd, a deity connected with the otherworld. In the Middle Welsh prose tale Culhwch ac Olwen, he is named as a member of Arthur's retinue and takes part in the quest to win the hand of Olwen for Arthur's cousin, Culhwch. Gwthyr would join Arthur on a journey to Pennant Gofid in Hell to retrieve the blood of the witch Orddu. His father is Greidawl Galldonyd, a fellow knight in Arthur's court. In Bonedd yr Arwyr, his genealogy is given as Gwythyr son of Greidawl the son of Enfael the son of Deigyr the son of Dyfnwal the son of Ednyfed the son of Maxen the son of Llywelyn. The Welsh Triads name him as the father of Arthur's second wife, also named Gwenhwyfar.

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