|Plot element from Arthurian legend|
|First appearance||Welsh Triads|
|Element of stories featuring||King Arthur|
Carnwennan, or Carnwenhau ("little white hilt"), was the dagger of King Arthur in the Welsh Arthurian legends. It is sometimes attributed with the magical power to shroud its user in shadow.
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 Rhongomiant. In Malory's Le Morte d'Arthur, Arthur has a dagger which he uses to kill a giant, but it is not named.
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