- Mesopotamia, located between the Tigris and Euphrates Rivers, is considered the cradle of civilization. Urban societies developed there as early as the 6th millennium BC.
- The Sumerians invented writing in the form of cuneiform script pressed into clay tablets around 3100 BC. They recorded economic transactions and other administrative documents.
- Gilgamesh was a historical king of Uruk in the 3rd millennium BC who was later worshipped as a demigod. His epic story is considered one of the earliest works of literature.
- Cylinder seals were used as signatures and for other administrative purposes in Mesopotamian cities beginning around 3500 BC. They