A Connecticut Yankee in King Arthurs Court by Mark Twain Chapter 3 Page 11

So the hermit searched all his wounds and gave him good salves; so the king was there three days, and then were his wounds well amended that he might ride and go, and so departed. And as they rode, Arthur said, I have no sword. No force,* [*Footnote from M.T.: No matter.] said Merlin, hereby is a sword that shall be yours and I may. So they rode till they came to a lake, the which was a fair water and broad, and in the midst of the lake Arthur was ware of an arm clothed in white samite, that held a fair sword in that hand. Lo, said Merlin, yonder is that sword that I spake of. With that they saw a damsel going upon the lake.

What damsel is that? said Arthur. That is the Lady of the lake, said Merlin; and within that lake is a rock, and therein is as fair a place as any