Which king had a magic sword named exacilbur?
The quasi mythical King Arthur. there are two different origin stories , one he pulled the sword out of a stone- hence (the Sword and the Stone), the other was it was given to him by the Lady of The Lake, a sort of water Nymph, no it does not bear U.S.M.C. markings! The whole thing is a fantasy like Robin Hood but with more magic and occultism involved, no such edged weapon exists.