|Plot element from Arthurian legend|
|First appearance||Welsh Triads|
|Element of stories featuring||King Arthur|
In the Welsh Triads, Carnwennan is listed alongside Rhongomiant, Arthur's spear, and Caledfwlch, Arthur's sword, as sacred weapons given to him by God: "the sacred weapons that God had given him: Rhongomiant his spear, Caledfwlch a sword, and Carnwennan his dagger" (Bromwich's translation).
Carnwennan is exclusive to the Welsh traditions of Arthur. Geoffrey of Monmouth's Historia Regum Britanniae excludes it, though it mentions the sword Caliburn and lance Ron. In Malory's Le Morte d'Arthur, Arthur has a dagger which he uses to kill a giant, but it is not named.
- Culhwlch and Olwen (Lady Charlotte Guest's translation)
- "The Twenty-Four Knights of Arthur's Court", The Welsh Triads
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