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non actually, the 8th century BC didn't even have people there, if your meaning the 8th millennium BC life just started
The 4th millennium BC.
The third millennium BC.
The 4th millennium BC began 4000 BC and ended in 3000 BC.
The 4th millennium BC marks the beginning of the bronze age and of writing.
Every millennium, including the 5th millennium BC, is 1000 years.