Excalibur, or Caliburn, is the legendary sword of King Arthur, sometimes also attributed with magical powers or associated with the rightful sovereignty of Britain. Excalibur and the Sword in the Stone (the proof of Arthur's lineage) are sometimes said to be the same weapon, but in most versions they are considered separate. Excalibur was associated with the Arthurian legend very early on. In Welsh, it is called Caledfwlch; in Cornish, Calesvol; in Breton, Kaledvoulc'h; and in Latin, Caliburnus.
Swords from Celtic mythology
Caladbolg (also Caladcholg), the sword of Fergus mac Roich and powerful enough to cut the tops off three hills; related to the Caledfwlch of Welsh mythology.
Caledfwich, often compared to Excalibur. This sword is used by Llenlleawg Wyddel to kill Diwrnach Wyddel and his men.
Ceard-nan Gallan, (the Smith of the Branches), sword of Oisin.
Claiomh Solais (Sword of Light), the sword of Nuada Airgeadlamh. The sword glowed with the light of the sun and was irresistible in battle, having the power to cut his enemies in half.
Cosgarach Mhor, (the Great Triumphant One), sword of Oscar.
Cruadh-Chosgarach, (the Hard Destroying One), sword of Cailte mac Ronain.
Dyrnwyn (White-Hilt), the Sword of Tydderch Hael. When drawn by a worthy or well-born man, the entire blade would blaze with fire. Rhydderch was never reluctant to hand the weapon to anyone, hence his nickname Hael "the Generous", but the recipients, as soon as they had learned of its peculiar properties, always rejected the sword.
Fragarach (also Sword of Air, Answerer or Retaliator), forged by the gods, wielded by Mahannan mac Lir and Lugh Lanfada. No armour could stop it, and it would grant its wielder command over the powers of wind.
Mac an Luin, (the Son of the Waves), sword of Fionn mac Cumhaill.
Moralltach (also Morallta), a sword given to, which left no stroke or blow unfinished at the first trial.
Beagalltach (also Begallta), a short sword given to Diaramud Ua Duibhne by his father Aengus. It broke in two pieces after hitting a boar with it.
Singing Sword of Conaire Mor , a sword that would sing in battle.
Cruaidin Catutchenn, the sword of Cu Chhulain.
Orna, the sword of the Fomorian king Tethra, which recounts the deeds done with it when unsheathed. It was taken by Ogma and it then recounted everything it had done.
