to an unidentified local endan (ruler). The excavators at nearby Tell Leilan (ancient Shekhna/Shubat-Enlil) have used the results from their investigations to argue that the Akkadian Empire came to an end due to a sudden drought, the so-called 4.2 kiloyear event. The impact of this climate event on Mesopotamia in general, and on the Akkadian Empire in particular, continues to be hotly debated. Excavation at the modern site of Tell Brak has suggested that the Akkadians rebuilt a city ("Brak" or "Nagar") on this site, for use as an administrative center. The city included two large buildings including a complex with temple, offices, courtyard, and large ovens. Dating and periodization The Akkadian period is generally dated to 2334–2154 BC (according to the middle chronology). The short-chronology dates of 2270–2083 BC are now considered less likely. It was preceded by the Early Dynastic Period of Mesopotamia (ED) and succeeded by the Ur III Period, although both transitions are blurry. For example, it is likely that the rise of Sargon of Akkad coincided with the late ED Period and that the final Akkadian kings ruled simultaneously with the Gutian kings alongside rulers at the city-states of both Uruk and Lagash. The Akkadian Period is contemporary with EB IV (in Israel), EB IVA and EJ IV (in Syria), and EB IIIB (in Turkey). Timeline of rulers The relative order of Akkadian kings is clear, while noting that the Ur III version of the Sumerian King List inverts the order of Rimush and Manishtushu. The absolute dates of their reigns are approximate (as with all dates prior to the Late Bronze Age collapse c. 1200 BC). History and development of the empire Pre-Sargonic Akkad The Akkadian Empire takes its name from the region and the city of Akkad, both of which were localized in the general confluence area of the Tigris and Euphrates Rivers. Although the city of Akkad has not yet been identified on the ground, it is known from various textual sources. Among these is at least one text predating the reign of Sargon. Together with the fact that the name Akkad is of non-Akkadian origin, this suggests that the city of Akkad may have already been occupied in pre-Sargonic times. Sargon of Akkad Sargon of Akkad defeated and captured Lugal-zage-si in the Battle of Uruk and conquered his empire. The earliest records in the Akkadian language date to the time of