Dear MKJ, excuse me for bothering, but it seems that some very important politico-economical incongruencies are existing in your chart-variant.
267) You are keeping 267 name for "Olonetz" province but famous "Olonezt kopi" region of medieval time is modern time - Karelia, I'm afraid. Land just beneath of White sea would be more appropriate named as "Vologda" region.
!) Ehm, it is just one way of resolving this problem - another is in 447-448) section.
268) You are keeping 268 province name for Vologda, but it's rather wrong call again. According to province.scv chart this region is very productive, but it's production is - Naval. The best call in this situation would be "Jaroslavl" name - zone of strong flax-raising and wood-cutting, but grain-output in Jaroslavl region was traditionally poor in comparison with more southern provinces. In any case former center of Jaroslavl principality must be mentioned (yep, you've mentioning him, but in wrong placement with wrong sort of production attached.
!) Ehm, it is just one way of resolving this problem - another is in 447-448) section.
270) You are renamed former Moscow province into Jaroslavl name, but it is wrong call again. According to province.scv resource value this province is producing Grain and has highest possioble value amongst other Russian Province of region. These requirement are met for "Zalessje" region and most important city in Zalessje is (and was) Vladimir. Then 270 must get "Vladimir" name.
!) Ehm, it is just one way of resolving this problem - another is in 447-448) section.
271) You are proposing 271 province as Kazan, but it is very bad idea - Tartar-filled lands became to be filled with Iron sources on North direction from very important Volga-Kama intersection. I'm afraid - Tartars were absent in these lands
It seems, "Perm" name, or "great Barmia" is more appropriate name for this province - due to its position and material source. "Vjatka" would be worse choice, because it's not quite best suite for local production, but it is rather good thing for placement accordance.
272) Naming former "Nizhgorod" province as "Cheboksarai" is really - daring move. I'm not sure if this is good idea - anyway. Nizhgorod was most important trading center of Russian Empire on very important River crossing (point of entrance of Oka River into Volga River). It means your idea to push Nizhgorod from River Valley into water-less zone is interesting, but - relly impractical, I'm afraid. 272 province is only possible place for keeping Nizhgorod on this chart in rather appropriate place, then "Chebok-saray" must go (I'm not sure if this city had real importance till October Revolution... and after it as well).
446) You are renaming former Kazan province into "Bolgary", but it is misunderstanding and anachronism. "Volga Bulgaria" existed till Mongol Invasion times - in other words - out from EU2 timespan. "Bulgars" start to be named - "Tartars", after their military leader - Berke Khan (third son of Juchi - eldest son of Ghenghis), which has a nickname - "Tartar", like modern Uzbecks are named for their quite popular in his times - Khan Uzbeck. In other words - there are not "Volga Bulgars" and "Volga Tartars" as different entities - it is the same ethnic group, which lived in Kama River Valley and is still living in the same place. More then that - ancient "Bulgar" - capital of "Volga Bulgaria", became to be "old Kazan", according to new rule ("Kazan" - strictly speaking, means - "sediment capital" in comparison to "sarai" - "moving capital"), then local inhabitants still named this broken fortress as their "capital" anyway. By the way - "Kazan" (or "New Kazan") was created in close vicinity of former "Bulgar"/"Old Kazan" city and in later times both cities became to be one whole - then modern Tartar now is boasting some undeniable truth - their Capital is more ancient then absolute majority of all Russian cities.
Making two different provinces - one "Kazan" and another - "Bolgary" is quite funny thing and isn't advisable for any purpose
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447 and 448) You are renaming "Tambow" province into "Ryazan" province... Hm-m-m... We are coming to really hard incongruency now. and this thing is led us to next problem.
Problem is - there isn't any big city in East direction in Moscow vicinity. Till 1302 year this place was taken by Perejaslav-Zalessky and Murom, but Perejaslavl became to be "shadow of Moscow" in 1302 and Murom lost his importance - earlier. (Then Muscovy started its huge growth onto East, because there wasn't any powerful neighbor, which can contain Muscovy in this direction. It means both 447 and 448 must be Ryazan, but - 447 position is more appropriate.
What must be name for 448 province? It is a big question.
!) I don't like an idea, but next possible candidate for East neighbor of Muscovy is Vladimir.
We will get next configuration - Jaroslavl, Vologda and Olonetz are remain to proposed by you places and 448 region start to be "Vladimir" (idea of richest by its grain resources Vladimir as poor Wool gathering center is quite revulsing, but... - this configuration is rather good thing for actual placement of Principalities in Medieval Russia).
Dixi - for a while.
Sincerely yours, Bash