Brenin Llwyd

[2] An archetypal description of the figure and its localities was given by the folklorist Marie Trevelyan in 1909: "Stories about the Brenin Llwyd, the Grey King or Monarch of the Mist, were told in the most mountainous districts.

[7] One of the most notable modern comparisons is with the Am Fear Liath Mòr (Scottish Gaelic for 'Big Grey Man'), a similarly ghostly figure associated with the mists on Ben Macdui in the Cairngorms mountain range of Scotland.

[8][9] As with other Welsh legends, aspects of the Brenin Llwyd mythos have been linked to the Middle English romance Gawain and the Green Knight.

Roger Sherman Loomis has suggested that the character of Bertilak de Hautdesert is an interpretation of Welsh legends such as the Brenin Llwyd.

[10][11] The fourth book in Susan Cooper's fantasy series The Dark is Rising, is named The Grey King after the Brenin Llwyd.