I have in the preceding pages given some instances of modern and mediæval magicians or wizards; but divination astrology and magic in this country are of very ancient date. The names of Idris Gawr, Gwyddion, the Diviner by Trees, and Gwyn, the son of Nud, have come down to us from prehistoric times. So great was these three's knowledge of the stars, that they could foretell whatever might be desired to know until the day of doom. In Welsh Mythology, several even of the kingly families are represented as playing the role of magicians, especially Rhiannon, the daughter of Heveydd Hen. Math Ap Mathonwy, King of Gwynedd, could form a maiden out of flowers, and transform men into deers and wolves, etc. But, perhaps, the greatest of all the wizards was Myrddin, or Merlin as he is known among English readers, who lived about the beginning of the sixth century. Myrddin was born in the neighbourhood of Carmarthen, or at least so it is believed; and it is also believed that the meaning of Carmarthen is Myrddin's town, and the people of Carmarthen to this day feel proud of such a famous prophet who was born in their town. Merlin (or Myrddin)'s fame spread throughout all the Western parts of Europe, if not to other parts of the world, and his mighty magic adorned the tales of romance, and in the tenth century one eminent scholar on the Continent, went as far as to write, a commentary on his prophecies or prognostications. But to confine ourselves to Welsh writers, we have some account of Merlin by Nennius in the eighth century, and by Geoffrey of Monmouth in the twelfth. Geoffrey says:--"Vortigern, after the infamous treachery of the long knives, retreated to Mount Erir--which is Eryri, or snowden--and here he ordered the building of a great tower of defence, whose foundations, however, were swallowed up by the earth as fast as they were filled in." The Magicians, on hearing this, said he must procure the blood of "a youth that never had a father," and sprinkle it on the stones and mortar. Vortigern, accordingly, sent messengers to different parts of the country in search of such a youth; and "in their travels they came to a city, called, afterwards, Caermerdin, where they saw some young men playing before the gate, and went up to them; but being weary with their journey, they sat them down there.... Towards evening, there happened on a sudden a quarrel between two of the young men, whose names were Merlin and Dalbutius. In the dispute, Dalbutius said to Merlin, 'As for you, nobody knows what you are, for you never had a father.' At that word the messengers looked earnestly upon Merlin, and asked who he was. They learnt it was not known who was his father, but that his mother was daughter to the King of Dimetia, and that she lived in St. Peter's Church, among the nuns of the city."