I noticed that in 1066, the Duke of Kiev has his capital in Terebovl. Something to be modded/fixed in a patch.
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The Capital moves to the richest province in the persons demise which is part of the highest title he holds. The files are set with Kiev as the capatal but Terebovl is richer so the Prince of Kiev moves there.
Well, Kiev should be modded to be richer then. It's the capital of all Rus for godsakes. 
In 1066 it should be richer than Novgorod even.
In 1066 it should be richer than Novgorod even.
Well this can only be changed in the province.csv file and any changes will kick through into all scenarios. The number between the culture and Duchy title it belongs too is the base income for the province.