Upon this the messengers hastened to the governor of the city, and ordered him, in the king's name, to send Merlin and his mother to the king. As soon as the governor understood the occasion of their message, he readily obeyed the order, and sent them to Vortigern to complete his design. When they were introduced into the king's presence, he received the mother in a very respectful manner, on account of her noble birth; and began to inquire of her by what man she had conceived. "My sovereign lord," said she, "by the life of your soul and mine, I know nobody that begot him of me. Only this I know, that as I was once with my companions in our chambers, there appeared to me a person in the shape of a most beautiful young man, who often embraced me eagerly in his arms, and kissed me; and when he had stayed a little time, he suddenly vanished out of my sight. But many times after this he would talk with me when I sat alone, without making any visible appearance. When he had a long time haunted me in this manner, he at last lay with me several times in the shape of a man, and left me with child. And I do affirm to you, my sovereign lord, that excepting that young man, I know no body that begot him of me." The king full of admiration at this account, ordered Maugantius to be called, that he might satisfy him as to the possibility of what the woman had related. Maugantius, being introduced, and having the whole matter repeated to him, said to Vortigern: "In the books of our philosophers, and in a great many histories, I have found that several men have had the like original. For, as Apuleius informs us in his book concerning the Demon of Socrates, between the moon and the earth inhabit those spirits, which we will call incubuses. These are of the nature partly of men, and partly of angels, and whenever they please assume human shapes, and lie with women. Perhaps one of them appeared to this woman, and begot that young man of her." CHAP. XIX.--_Merlin 's speech to the king's magicians, and advice about the building of the tower._