So thus they rode until that they came to Humber bank, where they heard a cry and a doleful noise. Then were they ware in the wind where came a rich vessel hilled over with red silk, and the vessel landed fast by them. Therewith Sir Tristram alighted and his knights. And so Sir Tristram went afore and entered into that vessel. And when he came within he saw a fair bed richly covered, and thereupon lay a dead seemly knight, all armed save the head, was all be-bled with deadly wounds upon him, the which seemed to be a passing good knight. How may this be, said Sir Tristram, that this knight is thus slain? Then Sir Tristram was ware of a letter in the dead knight’s hand. Master mariners, said Sir Tristram, what meaneth that letter? Sir, said they, in that letter ye shall hear and know how he was slain, and for what cause, and what was his name. But sir, said the mariners, wit ye well that no man shall take that letter and read it but if he be a good knight, and that he will faithfully promise to revenge his death, else shall there be no knight see that letter open. Wit ye well, said Sir Tristram, that some of us may revenge his death as well as other, and if it be so as ye mariners say his death shall be revenged.