Subsequent rulers of Isin appoint governors to…

Subsequent rulers of Isin appoint governors to rule over Lagash; one such governor is an Amorite named Gungunum.

He eventually breaks with Isin and establishes an independent dynasty in Larsa.

Gungunum, to legitimize his rule and deliver a blow to Isin, captures the city of Ur.

As the region of Larsa is the main center of trade via the Persian Gulf, Isin loses an enormously profitable trade route, as well as a city with much cultic significance.

Gungunum's two successors, Abisare, who reigned from about 1841 BCE to 1830 BCE) and Sumuel, who reigned from about 1830 BCE to 1801 BCE, both take steps to cut Isin completely off from access to canals.

Isin quickly loses political and economic force after this period.