In the case of a history so ancient as that of Assyria, we might well be content if our chronology were vague merely to the extent of the variations here indicated. The parade of exact dates with reference to very early times is generally fallacious, unless it be understood as adopted simply for the sake of convenience. In the history of Assyria, however, we may make a nearer approach to exactness than in most others of the same antiquity, owing to the existence of two chronological documents of first-rate importance. One of these is the famous Canon of Ptolemy, which, though it is directly a Babylonian record, has important bearings on the chronology of Assyria. The other is an Assyrian Canon, discovered and edited by Sir H. Rawlinson in 1862, which gives the succession of the kings for 251 years, commencing (as is thought) B.C. 911 and terminating B. C. 660, eight years after the accession of the son and successor of Esarhaddon. These two documents, which harmonize admirably, carry up an exact Assyrian chronology almost from the close of the Empire to the tenth century before our era. For the period anterior to this we have, in the Assyrian records, one or two isolated dates, dates fixed in later times with more or less of exactness; and of these we might have been inclined to think little, but that they harmonize remarkably with the statements of Berosus and Herodotus, which place the commencement of the Empire about B.C. 1300, or a little later. We have, further, certain lists of kings, forming continuous lines of descent from father to son, by means of which we may fill up the blanks that would otherwise remain in our chronological scheme with approximate dates calculated from an estimate of generations. From these various sources the subjoined scheme has been composed, the sources being indicated at the side, and the fixed dates being carefully distinguished from those which are uncertain or approximate. [Illustration: PAGE 372] It will be observed that in this list the chronology of Assyria is carried back to a period nearly a century and a half anterior to B.C. 1300, the approximate date, according to Herodotus and Berosus, of the establishment of the “Empire.” It might have been concluded, from the mere statement of Herodotus, that Assyria existed before the time of which he spoke, since an empire can only be formed by a people already flourishing. Assyria as an independent kingdom is the natural antecedent of Assyria as an Imperial power: and this earlier phase of her existence might reasonably have been presumed from the later. The monuments furnish distinct evidence of the time in question in the fourth, fifth, and sixth kings of the above list, who reigned while the Chaldaean empire was still flourishing in Lower Mesopotamia. Chronological and other considerations induce a belief that the four kings who follow like-wise belonged to it; and that, the “Empire” commenced with Tiglathi-Nin I., who is the first great conqueror.