شمشي أدد الأول
A main target for expansion was the city Mari, which controlled the caravan route between Anatolia and Mesopotamia. The king of Mari, Iakhdunlim, was assassinated by his own servants, possibly on Shamshi-Adad I's orders. Shamshi-Adad I seized the opportunity and occupied Mari c. 1741 BC. Shamshi-Adad I put his second son, Yasmah-Adad on the throne in Mari, and then returned to Shubat-Enlil. With the annexation of Mari, Shamshi-Adad was in control of a large empire, controlling the whole of Upper Mesopotamia.