Sumerianのタイムライン
5000 紀元前 – 200 紀元前 · 2 遺跡
Sumer is the usual starting point for “earliest cities”: Uruk, Ur, and neighbours on the southern Mesopotamian alluvium, with writing, temples, and irrigation appearing together in the fourth millennium BCE. Treat “first civilization” as a research shorthand, not a unique invention of complexity.