When we turn from these to the far more authentic annals of Tighernach, who died 1088 A.D., we are met at once by his often quoted dictum to the effect that "omnia Monumenta Scotorum usque Cimboeth incerta erant."[224] It would have been more satisfactory if he could have added that after that time they could be depended upon, but this seems by no means to have been the case. As, however, Cimboeth is reported to have founded Armagh, in the year 289 B.C., it gives us a limit beyond which we cannot certainly proceed without danger and difficulty. We get on surer ground when we reach the reign of Crimthann, who, according to Tighernach, died in the year of our era 85, after a reign of 16 years.[225] The 'Four Masters,' it is true, make him contemporary with Christ; but even Dr. O'Donovan is obliged to confess that all these earlier reigns, after the Christian era, are antedated to about the same extent.[226] Unfortunately for our purpose, however, Tighernach's early annals are almost wholly devoted to the chronicles of the kings of Emania or Armagh, and it is only incidentally that he names the kings of Tara, which was the capital both of the Firbolgs and Tuatha de Dananns, and he makes no allusion to the battles of Moytura. Though our annalist, therefore, to a certain extent deserts us here, there are incidental notices of the Daghda and his friends in Irish manuscripts referring to other subjects, which seem sufficient to settle the question. The best of these were collected together for another purpose by Petrie, in his celebrated work on the Round Towers, and, as they are easily accessible there, it will not be necessary to quote them in extenso, but merely the passages bearing directly on our subject.[227] The first extract is from a very celebrated work known as the 'Leabhar na l'Uidhre,' written apparently before 1106, which is given by the 'Four Masters' as the date of the author's death. Speaking of Cormac, the son of Art and grandson of Conn of a Hundred Battles:--"Before his death, which happened in 267, he told his people not to bury him at Brugh, on the Boyne, where the kings of Tara, his predecessors, were buried, because he did not adore stones and trees, and did not worship the same god as those interred at Brugh, for he had faith," adds the monkish chronicler, "in the one true God according to the law."