Post your ideas on flags here.
I am researching Russian 17th century flags and am considering making changes. The tricolor doesnt seem to have been used before 1668, and it is claimed that the original Russian flag was as below. However this too seems to date from 1668 so if someone can provide alternatives current to the 1600s before then they would like included post them here.
This is how it looks in game.
On the other hand this 19th century painting of the 17th century conquest of Siberia shows a flag from the Grand Principality of Muscovy from the late 1400s. So was the Muscovy Flag (depicting Christ) still in use in the 1600s? Info on this would be nice.