Cities have existed since about 5000 B.C. This post from Business Insider looks at some of the most important cities throughout history.
The list is made up from information collected in recent historical books on cities.
"The numbers were drawn from the size of a city's military in peacetime and in war, household data, agricultural commerce, church records, fortification sizes, food distribution, loss of life in a disaster, and city comparisons. Chandler revised his opus in 1987, applying greater detail and further research to his numbers.
In 2003, George Modelski expanded on Chandler's work and wrote World Cities, -3,000 to 2,000. The book remains the authoritative reference on historic population today."
FULL STORY: The 16 Greatest Cities In Human History

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