If we turn to the celebrated Hill of Tara, about ten miles off, where those resided who were buried at Brugh-na-Boinne, we find a great deal to confirm the views expressed above. When Petrie was attached to the Ordnance Survey, he had a very careful plan made of the remains on that hill, and compiled a most elaborate memoir regarding them, which was published in the eighteenth volume of the 'Transactions of the Royal Irish Academy.' It concludes with these words (p. 231): "From the historical allusions deduced it will be seen that, with the exception of the few last described,[233] they are all nearly contemporaneous and belong to the third century of the Christian era. The era of the original Tuatha de Danann Cathair belongs to the remote period of uncertain tradition. The only other monuments of ascertained date are those of Conor Mac Nessa and Cuchullim, both of whom flourished in the first century. These facts are sufficient to prove that before the time of Cormac Mac Art,[234] Tara had attained to no distinguished celebrity." [Illustration: 62. Rath na Riogh, or, Cathair of Cormac, at Tara.] The only difficulty in this passage is the allusion to the Tuatha de Danann. At the time Petrie wrote it he, like most Irish antiquaries, had been unable to emancipate himself from the spell of the 'Four Masters,' and, struck by the pains they had taken, and the general correctness of their annals after the Christian era, had adopted their pre-Christian chronology almost without question. The Cathair here alluded to is only an undistinguishable part of the Rath of Cormac, to which tradition attaches that name, but neither in plan, nor materials, nor construction can be separated from it. That the Dananns had a Cathair on this hill is more than probable if, as I suppose, they immediately preceded the Crimthann dynasty, who certainly resided here. It may also well be that they occupied this site, which is the highest on the hill, and that their palace was afterwards enlarged by Cormac. The plan of it is worth referring to (woodcut No. 62), from its curious resemblance to that of Avebury; what was here done in earth was afterwards done in stone in Wiltshire, and it seems as if, as is so often the case, the house of the dead was copied from the dwelling of the living. The Dagdha had apparently no residence here. From the context I would infer that he resided in the great Rath, about 300 feet diameter, at Dowth, where his son, apparently, was born, and near to which, as above shown, he also was buried. If, however, he had no residence on the Royal hill, his so-called spit was one of the most celebrated pieces of furniture of the palace. It was a most elaborate piece of ironmongery, and performed a variety of cooking operations in a very astonishing manner, and shows, at all events, that the smith who made it had no little skill in the working of iron, of which metal it was principally composed.[235]