In Celtic mythology, Gwyn or Gwynn ap Nudd was the ruler of Annwn (the underworld). He escorted the souls of the dead there, and led a pack of supernatural hounds, cwn annwn.
In the early Arthurian story Culhwch and Olwen, he abducted a maiden called Creddylad after she eloped with Gwythr ap Greidawl, Gwynâs long-time rival. Gwyn and Gwythrâs fight, which began on May Day, represented the contest between summer and winter. He helped Culhwch hunt the boar Twrch Trwyth. In later legends Gwyn is king of the tylwyth teg
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