Then Arthur and the men of his household prepared to go and seek Owain.  And Kynon, the son of Clydno, acted as their guide.  And Arthur came to the castle where Kynon had been before.  And when he came there, the youths were shooting in the same place, and the yellow man was standing hard by.  When the yellow man saw Arthur, he greeted him, and invited him to the castle.  And Arthur accepted his invitation, and they entered the castle together.  And great as was the number of his retinue, their presence was scarcely observed in the castle, so vast was its extent.  And the maidens rose up to wait on them.  And the service of the maidens appeared to them all to excel any attendance they had ever met with; and even the pages, who had charge of the horses, were no worse served that night than Arthur himself would have been in his own palace.

The next morning Arthur set out thence, with Kynon for his guide, and came to the place where the black man was.  And the stature of the black man was more surprising to Arthur than it had been represented to him.  And they came to the top of the wooded steep, and traversed the valley, till they reached the green tree, where they saw the fountain and the bowl and the slab.  And upon that Kay came to Arthur, and spoke to him.  “My lord,” said he, “I know the meaning of all this, and my request is that thou wilt permit me to throw the water on the slab, and to receive the first adventure that may befall.”  And Arthur gave him leave.

Then Kay threw a bowlful of water upon the slab, and immediately there came the thunder, and after the thunder the shower.  And such a thunder-storm they had never known before.  After the shower had ceased, the sky became clear, and on looking at the tree, they beheld it completely leafless.  Then the birds descended upon the tree.  And the song of the birds was far sweeter than any strain they had ever heard before.  Then they beheld a knight, on a coal-black horse, clothed in black satin, coming rapidly towards them.  And Kay met him and encountered him, and it was not long before Kay was overthrown.  And the knight withdrew.  And Arthur and his host encamped for the night.

And when they arose in the morning, they perceived the signal of combat upon the lance of the knight.  Then, one by one, all the household of Arthur went forth to combat the knight, until there was not one that was not overthrown by him, except Arthur and Gawain.  And Arthur armed himself to encounter the knight.  “O my lord,” said Gawain, “permit me to fight with him first.”  And Arthur permitted him.  And he went forth to meet the knight, having over himself and his horse a satin robe of honor, which had been sent him by the daughter of the Earl of Rhangyr, and in this dress he was not known by any of the host.  And they charged each other, and fought all that day until the evening.  And neither of them was able to unhorse the other.  And so it was the next day; they broke their lances in the shock, but neither of them could obtain the mastery.