After Ambrosius had conquered Vortigern and the Saxons and had been crowned King he brought together master craftsmen from every quarter and asked them to contrive some new kind of building that should stand for ever as a memorial. None of them were able to help him, until Tremorinus, Archbishop of Caerleon, suggested that the King should send for Merlin, Vortigern’s prophet, the cleverest man in the kingdom, “whether in foretelling that which shall be, or in devising engines of artifice”. Ambrosius forthwith sent out messengers, who found Merlin in the country of Gwent, at the fountain of Galapas where he customarily dwelt. The King received him with honour, and first asked him to foretell the future, but Merlin replied: “Mysteries of such kind be in no wise to be revealed save only in sore need. For if I were to utter them lightly or to make laughter, the spirit that teaches me would be dumb and would forsake me in the hour of need.” The King then asked him about the monument, but when Merlin advised him to send for the “Dance of the Giants that is in Killare, a mountain in Ireland”, Ambrosius laughed, saying it was impossible to move stones that everyone knew had been set there by giants. Eventually, however, the King was persuaded to send his brother Uther, with fifteen thousand men, to conquer Gilloman, King of Ireland, and bring back the Dance. Uther’s army won the day, but when they tried to dismantle the giant circle of Killare and bring down the stones, they could not shift them. When at length they confessed defeat, Merlin put together his own engines, and by means of these laid the stones down easily, and carried them to the ships, and presently brought them to the site near Amesbury where they were to be set up. There Merlin again assembled his engines, and set up the Dance of Killare at Stonehenge exactly as it had stood in Ireland. Shortly after this a great star appeared in the likeness of a dragon, and Merlin, knowing that it betokened Ambrosius’ death, wept bitterly, and prophesied that Uther would be King under the sign of the Dragon, and that a son would be born to him “of surpassing mighty dominion, whose power shall extend over all the realms that lie beneath the ray (of the star)”.