Alas, said Sir Launcelot unto King Arthur, what have ye done, for ye shall lose the most man of worship that ever came into your court.

It was his own desire, said Arthur, and therefore I might not do withal, for I have done all that I can and made them at accord.

Accord, said Sir Launcelot, fie upon that accord, for ye shall hear that he shall slay Sir Tristram, or put him in a prison, for he is the most coward and the villainest king and knight that is now living.
And therewith Sir Launcelot departed, and came to King Mark, and said to him thus: Sir king, wit thou well the good knight Sir Tristram shall go with thee.

Beware, I rede thee, of treason, for an thou mischief that knight by any manner of falsehood or treason, by the faith I owe to God and to the order of knighthood, I shall slay thee with mine own hands.
Sir Launcelot, said the king, overmuch have ye said to me, and I have sworn and said over largely afore King Arthur in hearing of all his knights, that I shall not slay nor betray him.

It were to me overmuch shame to break my promise.