"Now, fair nephew," said the King unto Sir Gawaine, "assay ye to take the sword for my love."
Therewith Sir Gawaine took the sword by the handles, though unwillingly and only at the King's commandment, but he might not stir it. Then the King said unto Sir Percivale that he should assay. So he set his hand on the sword and drew it strongly, but he might not move it. Then were there more that durst be so hardy as to set their hands thereto, but all failed.
"Now may ye go to your dinner," said Sir Kay unto King Arthur, "for a marvellous adventure have ye seen."
So the King and all went in, and every knight knew his own place and set himself therein, and all sieges were filled save only the Siege Perilous. Anon there befell a marvellous adventure, for all the doors and the windows of the place shut of themselves, yet then the hall was not greatly darkened, and therewith they were amazed, both one and other.
While they sat there in suspense as to what should happen, came in a good old man, and an ancient, clothed all in white, and there was no knight knew from whence he came. With him he brought a young knight in red arms, without sword or shield, save a scabbard hanging by his side. Then the old man said unto Arthur, "Sir, I bring here a young knight the which is of king's lineage and of the kindred of Joseph of Arimathea, whereby the marvels of this court and of strange realms shall be fully accomplished."
The King was right glad of the good man's words, and bade him and the young knight welcome. Then the old man made the young man unarm; and he was in a coat of red silk, and bore a mantle upon his shoulder that was furred with ermine. Anon the old knight led him unto the Siege Perilous, where beside sat Sir Percivale and Sir Launcelot. The good man lifted up the cloth, and found there letters that said thus: "This is the siege of Galahad, the high prince." He set him down surely in that siege, saying, "Wit ye well that place is yours," and then, departed and went his way.
All the knights of the Table Round marvelled greatly that Sir Galahad durst sit there in that Siege Perilous, and was so tender of age; for never before had anyone sat therein but he was mischieved. And they foresaw that Sir Galahad would come to great honour, and outdo them all in knightly courtesy.
Then the King bade him welcome to the court, and taking him by the hand, went down from the palace to show Galahad the adventures of the stone. "Sir" said the King unto him, "here is a great marvel as ever I saw, and right good knights have assayed and failed."
"Sir," said Galahad, "that is no marvel, for this adventure is not theirs but mine, and for the surety of this sword I brought none with me; for here by my side hangeth the scabbard."
Anon he laid his hand on the sword, and lightly drew it out of the stone and put it in the sheath, saying, "Now it goeth better than it did aforehand."