Pending the discovery of more complete annals, we must content ourselves with the general indications of the civilization that prevailed, and of the relations in which the principalities stood to one another, and with more or less doubtful reconstructions of the sequence in the dynasties.
In all of this period, however, the division between North and South Babylonia was kept tolerably distinct, even though occasionally, and for a certain period, a North Babylonian city, like that of Agade and Nippur, extended its jurisdiction over a section bordering on the south and _vice versa_.

It remained for a great conqueror, Hammurabi, the sixth king of a dynasty having its seat in the city of Babylon itself, who about the year 2300 B.C.succeeded in uniting North and South Babylonia under one rule.

With him, therefore, a new epoch in the history of the Euphrates Valley begins.

Henceforth the supremacy of the city of Babylon remains undisputed, and the other ancient centers, losing their political importance, retain their significance only by virtue of the sanctuaries existing there, to which pilgrimages continued to be made, and through the commercial activity that, upon the union of the various Babylonian districts, set in with increased vigor.
Attention was directed a few years ago by Pognon and Sayce to the fact that the name of Hammurabi, as well as the names of four kings that preceded him, and of a number that followed, are not Babylonian.

Sayce expressed the opinion that they were Arabic, and Professor Hommel has recently reenforced the position of Sayce by showing the close resemblance existing between these names and those found on the monuments of Southern Arabia.[21] While no evidence has as yet been found to warrant us in carrying back the existence of the Minean empire in Southern Arabia beyond 1500 B.C., still since at this period, this empire appears in a high state of culture, with commercial intercourse established between it and Egypt, as well as Palestine, the conclusion drawn by Hommel that Babylonia was invaded about 2500 B.C.by an Arabic-speaking people is to be seriously considered.