What was the population of the Umayyad Caliphate at its greatest extent (750 CE)?
According to Wikipedia it was 22 million.
According to McEvedy & Jones it was somewhere between 20–30 million.
I personally think 62 million is a pretty stiff/high estimate and those who claim it tend to be sourceless. However, given that M&J usually provide us with a low-end estimate, 22 million seems to be a very frugal claim. Any thoughts? I appreciate your input, thank you.