The Ignorance Is Strong In This One.
http://www.britannia.com/history/h7.html
Who Built Stonehenge?
The question of who built Stonehenge is largely unanswered, even today. The monument's construction has been attributed to many ancient peoples throughout the years, but the most captivating and enduring attribution has been to the Druid
http://www.reddit.com/r/AskHistorians/comments/1xa8q2/when_is_stonehenge_first_mentioned_in_history_did/
When is Stonehenge first mentioned in history? Did the Romans mention it?
I don't know that it wasn't mentioned earlier, but it certainly was mentioned in Geoffrey of Monmouth's 12th-century bestseller History of the Kings of Britain. Here is an excerpt:
Aurelius Ambrosius remembers the victims of Hengist's massacre
As Aurelius inspected the place in which the dead lay, he was moved to compassion and burst into tears ... it was his opinion that the greensward covering so many noble men who had died for their fatherland was certainly worthy of some memorial. Aurelius collected carpenters and stone-masons together from every region and ordered them to use their skill to contrive some novel building which would stand for ever in memory of such distinguished men. The whole band racked their brains and then confessed themselves beaten. Then Tremorinus, Archbishop of the City of the Legions [Caerleon], went to the King and said: "If there is anyone anywhere who has the ability to execute your plan, then Merlin ... is the one to do it."
Aurelius sends for Merlin
Aurelius ... sent a number of messengers ... to find [Merlin] and fetch him. They ... finally located Merlin in the territory of the Gewissei, at the Galabes Springs ... and then conducted him to the King.
Merlin's proposal
The King ... spoke to him about the monument which he was planning. "If you want to grace the burial-palce of these men with some lasting monument," replied Merlin, "send for the Giants' Ring which is on Mount Killaraus in Ireland. ... The stones are enormous and there is no one alive strong enough to move them. If they are placed in positino round this site, in the way in which they are erected over there, they will stand for ever."
At these words of Merlin's Aurelius broke out laughing. "How can such large stones be moved from so far-distant a country?" he asked. "It is hardly as if Britain itself is lacking in stones big enough for the job!"
"Try not to laugh in a foolish way, your Majesty," answered Merlin. ... "These stones are connected with certain secret religious rites and they have various properties which are medicinally important. Many years ago the Giants transported them from the remotest confines of Africa and set them up in Ireland at a time when they inhabited that country. ... There is not a single stone among them which hasn't some medicinal virtue."
Getting the stones
When the Britons heard all this, they made up their minds to send for the stones and to make war on the people of Ireland if they tried to hold them back. In the end the King's brother, Uther Pendragon, and fifteen thousand men, were chosen to carry out the task. ... At that time there reigned in Ireland a young man of remarkable valour called Gillomanius. As soon as he heard that the Britons had landed in the country, he collected a huge army together and hurried to meet them. ...
When he saw that the Irish were spoiling for a fight, Uther hurriedly drew up his own line of battle and charged at them. The Britons were successful almost immediately. The Irish were either mangled or killed outright, and Gillomanius was forced to flee. Having won the day, the Britons made their way to Mount Killaraus. ...
At [Merlin's] bidding they all set to with every conceivable kind of mechanism and strove their hardest to take the Ring down ... but none of these things advanced them an inch. When he saw what a mess they were making of it, Merlin burst out laughing. He placed in position all the gear which he considered necessary and dismantled the stones more easily than you could ever believe. Once he had pulled them down, he had them carried to the ships and stored on board, and they all set sail once more for Britain with joy in their hearts. ...
The installation
They came to the shore and then set off with the stones for the spot where the heroes had been buried. The moment that this was reported to him, Aurelius dispatched messengers to all the different regions of Britain, ordering the clergy and the people to assemble and, as they gathered, to converge on Mount Ambrius, where they were with due ceremony and rejoicing to re-dedicate the burial-place which I have described. ...
All came together on the appointed day. Aurelius placed the crown on his head and celebrated the feast of Whitsun in right royal fashion [he gives out various lands and titles]. Once he had settled these matters ... Aurelius ordered Merlin to erect round the burial-place the stones which he had brought from Ireland. Merlin obeyed the King's orders and put the stones up in a circle round the sepulchre, in exactly the same way as they had been arranged on Mount Killaraus in Ireland, thus proving that his artistry was worth more than any brute strength.
As with many of Geoffrey's stories, the historicity of this tale is a little doubtful, but it's certainly Stonehenge he's talking about.
https://en.wikipedia.org/wiki/Geoffrey_of_Monmouth
Geoffrey of Monmouth (Latin: Galfridus Monemutensis, Galfridus Arturus, Welsh: Gruffudd ap Arthur, Sieffre o Fynwy) (c. 1100 c. 1155) was a Welsh cleric and one of the major figures in the development of British historiography and the popularity of tales of King Arthur. He is best known for his chronicle Historia Regum Britanniae ("History of the Kings of Britain"), which was widely popular in its day and was credited, uncritically, well into the 16th century,[1] being translated into various other languages from its original Latin, but which is now considered historically unreliable.
