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.
Soulcalibur Legends
The story of "Soulcalibur Legends" takes place between "Soul Edge" and "Soulcalibur", and is based around Siegfried Schtauffen's transformation into Nightmare. The game begins as Siegfried finds Soul Edge on a ship. He battles Cervantes on the deck of the ship. Later, Siegfried is tasked by the Masked Emperor of the Holy Roman Empire to find the remaining pieces of Soul Edge in order to use it to win the war against Barbaros of the Ottoman Empire.