703) to a year in the reign of this monarch.

This "six hundred" may be used as a round number; but as Sennacherib considered that he had the means of calculating exactly, he would probably not have used a round number, unless it was tolerably near to the truth.

Six hundred years before B.C.703 brings us to B.C.
1303.
The chief uncertainty which attaches to the numbers in this part of the list arises from the fact that the nine kings from Tiglathi-Nin downwards do not form a single direct line.

The inscriptions fail to connect Bel-kudur-uzur with Tiglathi-Nin, and there is thus a probable interval between the two reigns, the length of which can only be conjectured.
The dates assigned to the later kings, from Vul-lush II., to Esarhaddon inclusive, are derived from the Assyrian Canon taken in combination with the famous Canon of Ptolemy.

The agreement between these documents, and between the latter and the Assyrian records generally, is exact; and a conformation is thus afforded to Ptolemy which is of no small importance.