Third Dynasty of Ur different from Neo-Sumerian period
Fall of Ur III
The power of the Neo-Sumerians was waning. Ibbi-Sin in the 21st century launched military campaigns into Elam, but did not manage to penetrate far into the country. In 2004/1940 BC (middle/short chronology respectively), the Elamites, allied with the people of Susa and led by Kindattu, king of the Elamite Shimashki dynasty, was able to surround Ur and managed to sack Ur(early summer?) and lead Ibbi-Sin into captivity, ending the third dynasty of Ur. After this victory, the Elamites destroyed the kingdom, and ruled through military occupation for the next 21 years.Mesopotamia then fell under Amorite influence. The Amorite kings of the Dynasty of Isin formed successor states to Ur III, starting the Isin-Larsa period. They managed to drive the Elamites out of Ur, rebuilt the city, and returned the statue of Nanna that the Elamites had plundered. The Amorites were nomadic tribes from the northern Levant who were Northwest Semitic speakers, unlike the native Akkadians of southern Mesopotamia and Assyria, who spoke East Semitic. By around the 19th century BC, much of southern Mesopotamia was occupied by the Amorites. The Amorites at first did not practice agriculture, preferring a semi-nomadic lifestyle, herding sheep. Over time, Amorite grain merchants rose to prominence and established their own independent dynasties in several south Mesopotamian city-states, most notably Isin, Larsa, Eshnunna, Lagash, and later, founding Babylon as a state.
not same as not identical to distinct from separate from unlike