With the spoils of his victories the walls of Ur were raised "high as heaven," and the temple of the Sun-god at Larsa was enlarged.

Erech was made his capital, and doubtless now received its Sumerian title of "the City" _par excellence_.
The dynasty of Erech was supplanted by the First dynasty of Ur.

Erech was captured by Lugal-kigub-nidudu of Ur, and took the second rank in the new kingdom.

The position of Ur on the western bank of the Euphrates exposed it to the attacks of the Semitic tribes of northern Arabia, and thus accustomed its inhabitants to the use of arms, while at the same time its proximity to Eridu made it a centre of trade.

In Abrahamic days it had long been a place of resort and settlement by Arabian and Canaanite merchants.
How long the supremacy of Ur lasted we do not know.