Gwyn ap Nudd (, sometimes found with the antiquated spelling Gwynn ap Nudd) is a Welsh mythological figure, the king of the Tylwyth Teg or "fair folk" and ruler of the Welsh Otherworld, Annwn. Described as a great warrior with a "blackened face", Gwyn is intimately associated with the otherworld in medieval Welsh literature, and is associated with the international tradition of the Wild Hunt.