Posssibly helpful Population resource Posted by Inkyatari on 7 October 2016 in English. I found this link. It may be of some use when calculating area vs. population Medieval Demographics Online
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Comment from isleño on 12 October 2016 at 20:15
Interesting link. Here are some other thoughts I posted earlier on OGF population calculations:
http://opengeofiction.net/user/tparigo/diary/422