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Another thing, when a region is starving, they would be a very high probability for the region to rebel, the peasant would take arms and the region would go rogue (or try, at least). Is so strange to see how a region population die until the last man, but totally loyal to the lord who let them die.
I don't where you have seen this but it is the opposite of how I usually is. Generally the region revolts which is what causes such low pop regions because they continue to starve until there is around a thousand or less peasants. It has just recently been softened so that you keep the region a bit longer to be able to save it but revolting quicker just causes more death.
