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I'm wondering how large a medieval city could feasibly get. While many towns and cities in Western Europe were around about 60,000 - such as Paris, London and Ypres, at various points - I'm aware that cities in Al-Andalus had six-figure populations, and I think Constantinople had, at one point, 250,000 residents.

What's the largest a medieval city could get, and what are the circumstances needed to get it that large? What other factors - such as food transportation and so forth - control the city's growth?
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