Carnwennan ("Little White Hilt") was the

dagger A dagger is a fighting knife with a very sharp point and usually one or two sharp edges, typically designed or capable of being used as a cutting or stabbing, thrusting weapon.State v. Martin, 633 S.W.2d 80 (Mo. 1982): This is the dictionary or ...

King Arthur According to legends, King Arthur (; ; ; ) was a king of Great Britain, Britain. He is a folk hero and a central figure in the medieval literary tradition known as the Matter of Britain. In Wales, Welsh sources, Arthur is portrayed as a le ...

in the Welsh Arthurian legends. In '' Culhwch and Olwen'', Arthur names it as one of the few things in the world which he will not give to Culhwch. Later, he uses it to slay the witch Orddu, the daughter of the witch Orwen, by slicing her in half. In the Welsh Triads, Carnwennan is listed alongside Arthur's spear Rhongomyniad and Arthur's sword Caledfwlch 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)."The Twenty-Four Knights of Arthur's Court", The Welsh Triads
Carnwennan is exclusive to the Welsh traditions of Arthur.

Geoffrey of Monmouth Geoffrey of Monmouth (; ; ) was a Catholic cleric from Monmouth, Wales, and one of the major figures in the development of British historiography and the popularity of tales of King Arthur. He is best known for his chronicle '' The History of ...

's ''

Historia Regum Britanniae (''The History of the Kings of Britain''), originally called (''On the Deeds of the Britons''), is a fictitious account of British history, written around 1136 by Geoffrey of Monmouth. It chronicles the lives of the List of legendary kings o ...

'' excludes it, though it mentions the sword Caliburn (a Latinization of Caledfwlch) and the lance Ron (likely an abbreviation of Rhongomyniad). In

Thomas Malory Sir Thomas Malory was an English writer, the author of ''Le Morte d'Arthur'', the classic English-language chronicle of the Arthurian legend, compiled and in most cases translated from French sources. The most popular version of ''Le Morte d'A ...

's ''

Le Morte d'Arthur ' (originally written as '; Anglo-Norman French for "The Death of Arthur") is a 15th-century Middle English prose reworking by Sir Thomas Malory of tales about the legendary King Arthur, Guinevere, Lancelot, Merlin and the Knights of the ...

'', Arthur has a dagger which he uses to kill a giant, but it is not named. Its name is sometimes given as "Carnwenhau" which comes from mistaken transcriptions of the handwritten texts.

References

Arthurian legend Medieval European swords Mythological weapons {{Knife-stub