Indeed, London or Paris would be far smaller in terms of population (and importance). Alexandria is a really good suggestion I hadn't thought of, thanks Lious. TinCow: my problem with most comparisons is that they're often 19th century. That's because only from about that time do we have any kind of decent statistical data to work with. So you get weird comparisons like imperial Rome and 1920 New York (I'm serious, check the article: Oates, The Population of Rome). So I want something a little closer. I thought Baghdad might be well attested in the sources (and so did my Professor, who actually suggested it).
Someone else has suggested Constantinople, but I'm not sure how well the two would compare. It would be worth a shot, though.
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