As soon as Sir Kay saw the sword, he knew well it was that one of the stone, and so he rode away to his father, Sir Ector, and said: "Sir, lo here is the sword of the stone; wherefore I must be king of this land."
When Sir Ector beheld the sword, all three returned to the church and entered it. Anon Sir Ector made Sir Kay to swear upon a book how he came by that sword. And Sir Kay answered that Arthur had brought it to him. "And how gat ye the sword?" said he to Arthur; and when Sir Ector heard how it had been pulled from the anvil, he said to Arthur: "Now I understand ye must be king of this land."
"Wherefore I?" said Arthur, "and for what cause?"
"Sir," said Ector, "for God will have it so; for there should never man have drawn out this sword but he that shall be rightwise king. Now let me see whether ye can put the sword there as it was, and pull it out again."
"That is no mastery," said Arthur, and so he put it into the stone. Therewith Sir Ector assayed to pull out the sword, and failed. Then Sir Kay pulled at it with all his might, but it would not yield.
"Now shall ye assay again," said Sir Ector to Arthur.
"I will well," said Arthur, and pulled it out easily a second time.
Now was Sir Ector sure that Arthur was of higher blood than had been thought, and that the rightful king had been made known. And he told his foster-son all, how he was not his father, but had taken him to nourish at Merlin's request. Arthur was grieved indeed when he understood that Sir Ector was not his father, and that the good lady that had fostered and kept him as her own son was not his true mother, and he said to Sir Ector, "If ever it be God's will that I be king, as ye say, ye shall desire of me what I may do, and I shall not fail you."
Therewithal they went unto the Archbishop and told him how the sword was achieved, and by whom. And all the barons came thither, that whoever would might assay to take the sword. But there before them all none might take it out but Arthur. Now many lords became wroth, and said it was great shame unto them all and to the realm to be governed by a boy. They contended so at that time that the matter was put off till Candlemas, when all the barons should meet there again. A pavilion was set over the stone and the sword, and the ten knights were ordained to watch there day and night, five being always on guard.