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5400 BCE: The City of Eridu is founded.
5000 BCE: Sumer inhabited by Ubaid people.
5000 BCE: Godin Tepe settled.
5000 BCE - 1750 BCE: Sumerian civilization in the Tigris-Euphrates valley.
5000 BCE - 4100 BCE: The Ubaid Period in Sumer.
5000 BCE: Evidence of burial in Sumer.
4500 BCE: The Sumerians built their first temple.
4500 BCE: The City of Uruk founded.
4100 BCE - 2900 BCE: Mesopotamian science and technology first appears in the Uruk Period of Sumer.
4100 BCE - 2900 BCE: Uruk Period in Sumer.
3600 BCE: Invention of writing in Sumer at Uruk.
3500 BCE: First written evidence of religion in Sumerian cuneiform.
3200 BCE: First instance of written language in Sumerian.
3000 BCE: Sumer civilization in Mesopotamia use gold in jewellery manufacture.
2900 BCE - 2334 BCE: The Early Dynastic Period in Sumer.
2700 BCE: Hatti people establish trade with the city of Sumer.
2700 BCE: First war in recorded history between Elam and Sumer; Sumer wins.
2600 BCE - 2000 BCE: The Royal Graves of Ur used in Sumer.
2500 BCE: First Dynasty of Lagash under King Eannutum is first empire in Mesopotamia.
2500 BCE: Beginning of literature in Sumerian.
2350 BCE: First code of laws by Urukagina, king of Lagash.
2334 BCE - 2218 BCE: The Akkadian Empire rules Sumer.
2218 BCE - 2047 BCE: The Gutian Period in Sumer.
2150 BCE - 1400 BCE: The Sumerian Epic of Gilgamesh written on clay tablets.
2100 BCE: The Reign of Utu-Hegal at Uruk in Sumer and creation of Sumerian King List.
2055 BCE - 2047 BCE: Utu Hegel's reign over Sumerian and Akkadian cities.
2047 BCE - 1750 BCE: Ur III Period in Sumer.
2047 BCE - 1750 BCE: The Ur III Period in Sumer. Great Wall of Uruk still standing.
2047 BCE - 2030 BCE: Ur-Nammu's reign over Sumer.
2047 BCE - 1750 BCE: The Ur III Period in Sumer, known as the Sumerian Renaissance.
2038 BCE: King Shulgi of Ur builds his great wall in Sumer.
2030 BCE: The Gutians rise again against Sumer. Ur-Nammu killed in battle.
1990 BCE: Construction of the Great Wall to keep the Amorites from Sumer.
1772 BCE: The Code of Hammurabi: One of the earliest codes of law in the world.
1750 BCE: Elamite invasion and Amorite migration ends the Sumerian civilization.
1120 BCE: Extant copy of the Sumerian Enuma Elish (creation story) is made from much older text.