Pardon me everyone,

The amount of money granted to each non-player faction every turn is given on a per-settlement basis. So if Rome controls all of Italy, this amounts to something approaching the 17,000 mnai deficit that Cataphract_Of_The_City said was being mysteriously compensated for.

This code is in Section 4b.

I'll consider putting a simple switch at the top of the file to turn this off.