To return to our history, however, a little further on Jeffrey asserts that Aurelius himself was buried "near the convent of Ambrius within the Giant's Dance (chorea gigantum), which in his lifetime he had commanded to be made."[129] As far as it goes, this is a distinct assertion that the place was used for burial, otherwise from the context we would gather that the Britons slain by Hengist were buried in the cemetery attached to the monastery, and that Stonehenge was consequently a cenotaph and not a monument. But again, in recording the life of Constantine, the nephew and successor of Arthur, after relating how he defeated the Saxons and took vengeance on the nephews of Mordred, he goes on to say--"Three years after this he was killed by Conan, and buried close to Uther Pendragon, within the structure of stones which was set up with wonderful art, not far from Salisbury, and called in the English tongue Stonehenge."[130] This last event, though no date is given, must have occurred some time between 546, or four years after Arthur's death, and 552, the date of the battle of Banbury Hill, where Conan his successor commanded. Assuming for the moment that this may be the case, may it not suffice to explain one of the mysteries of Stonehenge, the presence of the pairs of blue stones inside the choir? Why may we not suppose that these were erected in memory of the kings or others who were buried in front of them? Why may not Aurelius and Constantine have been buried in front of the two small pairs at either end of the so-called altar stone? If this were so, and it appears to me extremely probable that it was, the last remains of the mist that hangs over the uses of this monument would be dispersed. From the time of Jeffrey (1147) all subsequent mediæval historians adopt the account of these events given by him, with occasional but generally slight variations, and even modern critics are inclined to accept his account of Constantine and Conan, as his narrative can be checked by that of Gildas, who was cotemporary with these kings. Similar statements are also found in the triads of the Welsh bards, which some contend are original and independent authorities.[131] My own impression is that they may be so, but I do not think their independence has been so clearly established as to enable us to found any argument upon it. On the other hand, the incidental allusion of Jeffrey to the erection of Stonehenge as a cenotaph to the slain nobles, and the subsequent burial there of the two kings, seems so likely and natural that it is difficult to see why they should be considered as inventions. The two last-named events, at all events, do not add to the greatness or wonder of the kings, or of his narrative, and are not such things as would be inserted in the page of history, unless they were currently known, or were recorded somewhere in some writing to which the historian had access.