Excalibur
Geoffrey of Monmouth, in his "Historia Regum Britanniae" ("The History of the Kings of Britain", c. 1136), Latinised the name of Arthur's sword as "Caliburnus" (potentially influenced by the Medieval Latin spelling "calibs" of Classical Latin "chalybs", from Greek "chályps" ["χάλυψ"] "steel"). Most Celticists consider Geoffrey's "Caliburnus" to be derivative of a lost Old Welsh text in which "bwlch" (Old Welsh "bulc[h]") had not yet been lenited to "fwlch" (Middle Welsh "vwlch" or "uwlch"). In the late 15th/early 16th-century Middle Cornish play "Beunans Ke", Arthur's sword is called "Calesvol", which is etymologically an exact Middle Cornish cognate of the Welsh "Caledfwlch". It is unclear if the name was borrowed from the Welsh (if so, it must have been an early loan, for phonological reasons), or represents an early, pan-Brittonic traditional name for Arthur's sword.
The Heaven Sword and Dragon Saber
Set in the late Yuan dynasty, the story revolves around a pair of priceless and extremely powerful weapons, the Heaven Reliant Sword (倚天劍) and Dragon Slaying Saber (屠龍刀), which are coveted by many martial artists in the "jianghu". Either or both of them are thought to allow their wielder to rule the "wulin" (martial artists' community), according to a widely circulated mantra which goes, "Honoured by the "wulin", the precious Saber slays the Dragon. It commands the world. Who dares to disobey? If the Heaven Reliant does not appear, who can challenge it?" (武林至尊，寶刀屠龍，號令天下，莫敢不從！倚天不出，誰與爭鋒？) The origins of this mantra are not known at the beginning of the novel.