I am writing a TL where Fatimid Egypt plays a role, and it would be very helpful if anyone has a population estimate for that (circa 1000 CE). Wikipedia gives an uncited figure of 6.2 million for some uncertain point in time for the entire Fatimid Caliphate, which is neither too trustworthy or useful.
Also (and somewhat unrelatedly), does Anatolia having 9 million people at the same time frame make sense, or does that figure have to be pushed down by a lot?