Tovec
Explorer
I think it depends on what technological level FR is set. I know when I was doing research for my own setting I decided to squew earlier in history as opposed to the later (and larger) population numbers. In my setting it ranges from 100-200 million worldwide, a population which I think is comparable to the domain controlled by the roman empire at its peak (I think, haven't done research on this in a while). Also, for my setting, most of the population doesn't live on the main continent and so a major city is usually 20k-100k. Especially large ones will be more, but not usually going over 200k. That is a huge difference from the major centre of 1 million you are suggesting. I think it also comes with different assumptions though, what kinds of resources are available, how prolific trade is when you have many times more people in a few days travel and when a city is so much larger as to be a trade hub for millions and millions of people.
In general, I think the numbers you have been given are probably pretty good overall. They seem to have backing in canon material too so that helps. But hundreds of thousands is a more realistic figure than millions (in a pre-modern setting). Even if you are going for the roman empire figures then it starts to skew much higher but in that case you also have to realize they were the biggest government in the world and controlled most of it. So the figures (I seem to recall) were maybe 100 million in the roman empire - that is most of the world at the time - which affords a much larger capital. But that is much different than a free city or a smallish kingdom that FR seems to be defined as having.
In general, I think the numbers you have been given are probably pretty good overall. They seem to have backing in canon material too so that helps. But hundreds of thousands is a more realistic figure than millions (in a pre-modern setting). Even if you are going for the roman empire figures then it starts to skew much higher but in that case you also have to realize they were the biggest government in the world and controlled most of it. So the figures (I seem to recall) were maybe 100 million in the roman empire - that is most of the world at the time - which affords a much larger capital. But that is much different than a free city or a smallish kingdom that FR seems to be defined as having.