ED I is contemporary with the culture of the Scarlet Ware pottery typical of sites along the Diyala in Lower Mesopotamia, the Ninevite V culture in Upper Mesopotamia, and the Proto-Elamite culture in southwestern Iran. New artistic traditions developed in Lower Mesopotamia during the ED II (2750/2700–2600 BC). These traditions influenced the surrounding regions. According to later Mesopotamian historical tradition, this was the time when legendary mythical kings such as Lugalbanda, Enmerkar, Gilgamesh, and Aga ruled over Mesopotamia. Archaeologically, this sub-period has not been well-attested to in excavations of Lower Mesopotamia, leading some researchers to abandon it altogether. The ED III (2600–2350 BC) saw an expansion in the use of writing and increasing social inequality. Larger political entities developed in Upper Mesopotamia and southwestern Iran. ED III is usually further subdivided into the ED IIIa (2600–2500/2450 BC) and ED IIIb (2500/2450–2350 BC). The Royal Cemetery at Ur and the archives of Fara and Abu Salabikh date back to ED IIIa. The ED IIIb is especially well known through the archives of Girsu (part of Lagash) in Iraq and Ebla in Syria. The end of the ED is not defined archaeologically but rather politically. The conquests of Sargon and his successors upset the political equilibrium throughout Iraq, Syria, and Iran. The conquests lasted many years into the reign of Naram-Sin of Akkad and built on ongoing conquests during the ED. The transition is much harder to pinpoint within an archaeological context. It is virtually impossible to date a particular site as being that of either ED III or Akkadian period using ceramic or architectural evidence alone. The Early Dynastic period is preceded by the Uruk Period (ca. 4000—3100 BCE) and the Jemdet Nasr period (ca. 3100—2900 BCE). A full list of rulers, some of them legendary, is given by the Sumerian King List ("SKL"). The Early Dynastic period is followed by the rise of the Akkadian Empire. The preceding Uruk period in Lower Mesopotamia saw the appearance of the first cities, early state structures, administrative practices, and writing. Evidence for these practices was attested to during the Early Dynastic period. The ED period is the first for which it is possible to say something about the ethnic composition of the population of Lower Mesopotamia.