But amongst them were six kings of great renown and might, who more than all raged against Arthur and determined to destroy him, namely, King Lot, King Nanters, King Urien, King Carados, King Yder, and King Anguisant. These six, therefore, joining their armies together, laid close siege to the city of Caerleon, wherefrom King Arthur had so shamefully driven them.
And after fifteen days Merlin came suddenly into their camp and asked them what this treason meant. Then he declared to them that Arthur was no base adventurer, but King Uther's son, whom they were bound to serve and honor even though Heaven had not vouch-safed the wondrous miracle of the sword. Some of the kings, when they heard Merlin speak thus, marveled and believed him; but others, as King Lot, laughed him and his words to scorn, and mocked him for a conjurer and wizard. But it was agreed with Merlin that Arthur should come forth and speak with the kings.
So he went forth to them to the city gate, and with him the archbishop and Merlin, and Sir Key, Sir Brastias, and a great company of others. And he spared them not in his speech, but spoke to them as king and chieftain, telling them plainly he would make them all bow to him if he lived, unless they choose to do him homage there and then; and so they parted in great wrath, and each side armed in haste.
"What will ye do?" said Merlin to the kings; "ye had best hold your hands, for were ye ten times as many ye should not prevail."
"Shall we be afraid of a dream-reader?" quoth King Lot in scorn.
With that Merlin vanished away and came to King Arthur.
Then Arthur said to Merlin, "I have need now of a sword that shall chastise these rebels terribly."
"Come then with me," said Merlin, "for hard by there is a sword that I can gain for thee."
So they rode out that night till they came to a fair and broad lake, and in the midst of it King Arthur saw an arm thrust up, clothed in white samite, and holding a great sword in the hand.
"Lo! yonder is the sword I spoke of," said Merlin.