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While duchies can change de jure kingdom due to assimilation, the counties which belong to a duchy will almost never change in the course of a normal game session (though certain events can change them).
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If the Conclave Expansion is inactive, the Crown Authority law is enabled if a duke-tier character creates a title.If Conclave DLC is active, they are accessible under realm laws tab "Centralization" law and "Tribal Organization" law (for tribal rulers).All previous laws unlocked by independent county rulers.Laws Panel: An independent duke-rank liege may change the following legislation:.Enables use of crown focus (requires The Reaper's Due Expansion): An independent (or powerful vassal) duke-tier character may improve a province of their demesne by increasing its prosperity yearly gain and triggering events.Grand duke title: If the duke-tier character holds two or more duchies, they earn +1 demesne limit."Emergency" usurp: If a Duke+ would become unlanded after losing a war, and a vassal controls a de jure county, they'll usurp the county from the vassal.Activates passive generation of technology points for non-nomads.Capital duchy bonus: All holdings directly owned by the duke-tier character, inside every de jure province located in the capital duchy (excluding the capital county itself), recieve +25% levy bonus if the duke (or equivalent) is independent, or +15% if the duke is a vassal.
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