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Believable Population Size for a City on Your Fantasy Map — Map Effects
Medieval Demographics – Save vs. Hollowing
Population-Area Relationship for Medieval European Cities
In some sources, the population of Rome dropped very low during the middle ages, and as low as 17,000 in 1347AD. How reliable are these numbers? - Quora
Life expectancy - Wikipedia
Get Medieval: The Town in the Middle Ages – Ludus Ludorum
What was the population density of Medieval London like compared to the modern day? Was it more people per square kilometer or less? - Quora