Cynon ap Clydno or in some translations Kynon[nb 1] or Cynan was an Arthurian hero from Welsh mythology. His quest to the Castle of Maidens and his subsequent trial against the Black Knight, serve as a prelude to the adventure of Owain and The Lady of the Fountain. Cynon is closely associated with Sir Calogrenant, who takes his role in other versions of the tale.
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