1st millennium BC

The 1st millennium BC, also known as the last millennium BC, was the period of time lasting from the years 1000 BC to 1 BC (10th to 1st centuries BC; in astronomy: JD 1356182.51721425.5). It encompasses the Iron Age in the Old World and sees the transition from the Ancient Near East to classical antiquity.

Millennia:
Centuries:

World population roughly doubled over the course of the millennium, from about 100 million to about 200–250 million.

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