Well there was the sword that destroyed Sauron by merely cutting off his hand (and his precious ring). Oh, you mean really as in real. Bah.
Seriously, Arthur's sword may have been said to be magic because of the deeds he achieved using it. So, was there a sword? Most certainly, granting that Arthur was probably a Roman soldier. Was it magic? Not hardly. Well made more likely (by the elves).
Uh...you mean Khazâd, my FRiend. ;-)