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(31st century BC - 30th century BC - 29th century BC - other centuries) (4th millennium BC - 3rd millennium BC - 2nd millennium BC) Events: 2925 - 2776 BC -- First Dynasty wars in Egypt Significant persons: Inventions, Discoveries, Introductions: The shekal was introduced in Mesopotamia as a monetary and weight unit, see Historical weights and measures.
(4th millennium BC - 3rd millennium BC - 2nd millennium BC)
Significant persons:
Inventions, Discoveries, Introductions: