Which Sumerian city was very powerful and influential during the Early Dynastic period and once a coastal city?
Early Dynastic Period (Mesopotamia) The Early Dynastic period (abbreviated ED period or ED) is an archaeological culture in Mesopotamia (modern-day Iraq) that is generally dated to "c." 2900—2350 BC. It was preceded by the Uruk and Jemdet Nasr periods, and saw the invention of writing and the formation of the first cities and states. The ED itself was characterized by the existence of multiple city-states: small states with a relatively simple structure that developed and solidified over time. This development ultimately led to the unification of much of Mesopotamia under the rule of Sargon, the first monarch of the Akkadian Empire. Despite this political fragmentation, the ED city-states shared a relatively homogeneous material culture. Sumerian cities like Uruk, Ur, Lagash, Umma and Nippur, located in Lower Mesopotamia, were very powerful and influential. To the north and west stretched states centered on cities such as Kish, Mari, Nagar and Ebla.
Ibbi-Sin Ibbi-Sin, son of Shu-Sin, was king of Sumer and Akkad and last king of the Ur III dynasty, and reigned c. 1963 BC-1940 BC (Short chronology). During his reign, the Sumerian empire was attacked repeatedly by Amorites. As faith in Ibbi-Sin's leadership failed, Elam declared its independence and began to raid as well.