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tobias.mb

General
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Dec 16, 2013
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It's been some time since I played Base-Game Ming. But afaik Mandate of Heaven should be either a positive modifier (reducing unrest) when your monarch legitimacy is >60 or else it turns into a severe penalty.
Without any other Information that would be my first guess.

If you can raise legitimacy manually (in the government tab), you can use that. (It's a function from some DLC I believe)
There are also some (Ming) events, that help you get legitimacy.