Category:40th century BC
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|Millennium:||4th millennium BC|
|Centuries:||41st century BC - 40th century BC - 39th century BC|
|Decades:||3990s BC 3980s 3970s 3960s 3950s 3940s 3930s 3920s 3910s 3900s BC|
|Point in time|
The 40th century BC, from 4000 BC to 3901 BC.