Merlin, who had listened to all this, then demanded that he should be allowed to confront the wizards. “Bid thy wizards come before me, and I will convict them of having devised a lie.” The King, struck by the youth’s boldness and apparent lack of fear, did as he asked and sent for the wizards. To whom Merlin spoke as follows: “Since ye know not what it is that doth hinder the foundation being laid of this tower, ye have given counsel that the mortar thereof should be slaked with my blood, so that the tower should stand forthwith. Now tell me, what is it that lieth hid beneath the foundation, for somewhat is there that doth not allow it to stand?” But the wizards, afraid of showing ignorance, held their peace. Then said Merlin (whose other name is Ambrosius): “My lord the King, call thy workmen and bid them dig below the tower, and a pool shalt thou find beneath it that doth forbid thy walls to stand.” This was done, and the pool uncovered. Merlin then commanded that the pool shall be drained by conduits; two stones, he said, would be found at the bottom, where two dragons, red and white, were lying asleep. When the pool was duly drained, and the stones uncovered, the dragons woke and began to fight ferociously, until the red had defeated and killed the white. The King, amazed, asked Merlin the meaning of the sight, and Merlin, raising his eyes to heaven, prophesied the coming of Ambrosius and the death of Vortigern. Next morning, early, Aurelius Ambrosius landed at Totnes in Devon.