is numbered in reference to previous "dynasties" of Ur according to the historical reconstruction of the Mesopotamian past written in the Sumerian King List, such as the First Dynasty of Ur (26-25th century BC), but it seems the once supposed Second Dynasty of Ur was never recorded.

This kingdom was founded by Ur-Namma (c. 2112-2095 BC), who succeeded in reuniting southern Mesopotamia a few decades after the fall