Third Dynasty of Ur
Ishbi-Erra ("fl." "c." 1953—1920 BCE by the short chronology) was the founder of the Dynasty of Isin. Ishbi-Erra of the First Dynasty of Isin was preceded by Ibbi-Sin of the Third Dynasty of Ur in ancient Lower Mesopotamia, and then succeeded by Šu-ilišu. According to the Weld-Blundell Prism, Ishbi-Erra reigned for 33 years and this is corroborated by the number of his extant year-names. While in many ways this dynasty emulated that of the preceding one, its language was Akkadian as the Sumerian language had become moribund in the latter stages of the Third Dynasty of Ur.