The early monarchs reign at Ur (Mugheir), and leave no traces of themselves further north than Niffer.

Sin-Shada holds his court at Erech (Warka), twenty-five miles above Mugheir; while Naram-Sin is connected with the still more northern city of Babylon.

We shall find a similar tendency in Assyria, as it rose into power.

In both cases we may regard the fact as indicative of a gradual spread of empire towards the north, and of the advance of civilization and settled government in that direction.
A king, who disputes the palm of antiquity with Naram-Sin, has left various records at Erech or Warka, which appears to have been his capital city.

It is proposed to call him Sin-Shada.