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Encyclopedia > 31st century BC
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31st century BC
(32nd century BC - 31st century BC - 30th century BC - other centuries)
Events:
(5th millennium BC - 4th millennium BC - 3rd millennium BC)
Events:
Significant persons:
- Ur-nina[?] first king of Lagash in Mesopotamia
Inventions, Discoveries, Introductions:
- Chinese ideograms
- Drainage and sewage system in India
- Dams, canals, stone sculptures[?] using inclined plane and lever in Sumeria
- Pyramids in Ancient Egypt
- Copper was in use, both as tools and weapons.
- Crude writing existed in Egypt, and cuneiform writing was invented in Mesopotamia.
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