[4][1] Rim-Sin’s reign of Larsa started sometime around 1822 BC (in middle chronology) when he succeeded his brother, Warad-Sin.

He immediately began to expand Larsa by attacking the neighboring city-states of Uruk, Isin, and Babylon.

He defeated them, then occupied Pi-Naratim (the mouths of the Tigris and Euphrates) in 1807, Zibnatum in 1805, Bit-Susin and Uzarbara in 1804, and Kisarra in 1802.

[5][6][7] In 1787 BC, Hammurabi, the king of Babylon, attacked Isin and reports to have conquered it, but this is more likely an exaggeration of a successful raid.

Hammurabi's forces quickly reached Larsa, and after a six-month siege the city fell.