Thus there are ample grounds for regarding the date 2232 B.C. as representing the beginning of the historical period in the chronological system of Berossus;[76] and we have already noted that in a late Babylonian historian, writing during the Hellenistic period, we should expect the beginning of his history, in the stricter sense of the term, to coincide with the first recorded dynasty of Babylon, as distinct from rulers of other and earlier city-states. It will be observed that this date is only seven years out with that obtained astronomically by Dr. Kugler for the rise of the First Dynasty of Babylon. Now the astronomical demonstration relates only to the reign of Ammi-zaduga, who was the tenth king of the First Dynasty; and to obtain the date 2225 B.C. for Sumu-abum's accession, reliance is naturally placed on figures for the intermediate reigns which are supplied by the contemporaneous date-lists. But the Babylonian Kings' List gives figures which were current in the Neo-Babylonian period; and, by employing it in place of contemporaneous records, we obtain the date 2229 B.C. for Sumu-abum's accession, which presents a discrepancy of only three years to that deduced from Berossus. In view of the slight inconsistencies with the Kings' List which we find in at least one of the late chronicles, it is clear that the native historians, who compiled their records during the later periods, found a number of small variations in the chronological material on which they had to rely. While there was probably agreement on the general lines of the later chronology, the traditional length of some reigns and dynasties might vary in different documents by a few years. We may conclude therefore that the evidence of Berossus, so far as it can be reconstituted from the summaries preserved in other works, may be harmonized with the date obtained independently for the First Dynasty of Babylon.