One of the most extraordinary personages whose story is thus delivered to us, is Merlin. He appears to have been contemporary with the period of the Saxon invasion of Britain in the latter part of the fifth century; but probably the earliest mention of his name by any writer that has come down to us is not previous to the eleventh. We may the less wonder therefore at the incredible things that are reported of him. He is first mentioned in connection with the fortune of Vortigern, who is represented by Geoffrey of Monmouth as at that time king of England. The Romans having withdrawn their legions from this island, the unwarlike Britons found themselves incompetent to repel the invasions of the uncivilised Scots and Picts, and Vortigern perceived no remedy but in inviting the Saxons from the northern continent to his aid. The Saxons successfully repelled the invader; but, having done this, they refused to return home. They determined to settle here, and, having taken various towns, are represented as at length inviting Vortigern and his principal nobility to a feast near Salisbury under pretence of a peace, where they treacherously slew three hundred of the chief men of the island, and threw Vortigern into chains. Here, by way of purchasing the restoration of his liberty, they induced him to order the surrender of London, York, Winchester, and other principal towns. Having lost all his strong holds, he consulted his magicians as to how he was to secure himself from this terrible foe. They advised him to build an impregnable tower, and pointed out the situation where it was to be erected. But so unfortunately did their advice succeed, that all the work that his engineers did in the building one day, the earth swallowed, so that no vestige was to be found on the next. The magicians were consulted again on this fresh calamity; and they told the king that that there was no remedying this disaster, other than by cementing the walls of his edifice with the blood of a human being, who was born of no human father. Vortigern sent out his emissaries in every direction in search of this victim; and at length by strange good fortune they lighted on Merlin near the town of Caermarthen, who told them that his mother was the daughter of a king, but that she had been got with child of him by a being of an angelic nature, and not a man. No sooner had they received this information, than they seized him, and hurried him away to Vortigern as the victim required. But in presence of the king he baffled the magicians; he told the king that the ground they had chosen for his tower, had underneath it a lake, which being drained, they would find at the bottom two dragons of inextinguishable hostility, that under that form figured the Britons and Saxons, all of which upon the experiment proved to be true.