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6000 BCE - 1750 BCE: Sumerian civilization in the Tigris-Euphrates valley.
5400 BCE: The City of Eridu is founded.
5000 BCE: Sumer inhabited by Ubaid people.
5000 BCE - 4100 BCE: The Ubaid Period in Sumer.
5000 BCE: Evidence of burial in Sumer.
4500 BCE: The City of Uruk founded.
4500 BCE: The Sumerians built their first temple.
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.
2900 BCE - 2334 BCE: The Early Dynastic Period in Sumer.
2500 BCE: Beginning of literature in Sumerian.
2350 BCE: First code of laws by Urukagina, king of Lagash.
2150 BCE - 1400 BCE: The Sumerian Epic of Gilgamesh written on clay tablets.
2047 BCE - 1750 BCE: The Ur III Period in Sumer, known as the Sumerian Renaissance.
2047 BCE - 1750 BCE: The Ur III Period in Sumer. Great Wall of Uruk still standing.
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.