The _Annals of Ulster_ (and Tigernach) have some entries in Latin and others in Irish. Of the Latin entries, some relate to Roman history, others to native history. So far as the fifth and sixth centuries are concerned, it is reasonable to conjecture that the Latin entries represent an early and generally accepted synchronistic reconstruction, which had been made with the help of Roman annals, and especially the Chronicle of Marcellinus. It has been proved by Dr. MacCarthy, from the synchronistic treatises which he has studied in connexion with Tigernach, that the chronology of pre-Patrician history was based on Jerome’s edition of the Chronicle of Eusebius. For the fifth and sixth centuries Isidore and Bede are referred to, as well as Marcellinus; but most of the foreign entries are taken verbally from Marcellinus. The difficulties and uncertainties of the synchronisers seem to be reflected in the alternative dates of the _Annals of Ulster_, where an event given under one year often appears in another place, with the addition _hic alii dicunt_, or something of the kind. In regard to the few and brief entries relating to Patrick, the internal evidence testifies to the antiquity of the tradition, and excludes any suspicion of fabrication on the part of the annalistic compilers. While the legendary date of Patrick’s death, which had become vulgar in the seventh century, was admitted and emphasised, the true date, notwithstanding the inconsistency, was allowed to remain; and in the second place, not a single notice based on the assumption that Patrick was still alive appears in the interval between the true date and the false date. A fabricator who was concerned to invent notices about Patrick would not have been likely to leave thirty years a complete blank. Thus if the few Patrician entries prior to A.D. 461 were fabrications, it would seem that they must have been invented before the legendary date of his death in A.D. 493 had become current. This consideration establishes a strong presumption of their antiquity; if they are not genuine, they must have been very early inventions. But intrinsically they offer nothing to arouse suspicion; on the contrary, it is incredible that a fabricator, producing annalistic records in the interest of a “Patrician legend,” would have confined himself to the interpolation of just these slender notices. These entries will be found under the years 432, 439, 441, 443, 444, 461; the notices of the deaths of Secundinus, 447 (_Ann. Inisf._ 448), and Auxilius, 459, may perhaps be added.