Jesu, mercy, said Arthur, what knight was that with the covered shield? I know not, said Sir Tristram; and so said they all. Now, said King Arthur, then wot I, for it is Sir Launcelot. Then they all looked upon Sir Launcelot and said: Ye have beguiled us with your covered shield. It is not the first time, said Arthur, he hath done so. My lord, said Sir Launcelot, truly wit ye well I was the same knight that bare the covered shield; and because I would not be known that I was of your court I said no worship of your house. That is truth, said Sir Gawaine, Sir Kay, and Sir Bleoberis.

Le Morte D'Arthur