A character's demesne (pronounced /dɪ'meɪn/, almost but not quite like "domain") will usually provide the majority of their income, as well as a decent amount of levies. It is within one's demesne that most construction occurs, including construction of new settlements in empty slots.
Each ruler has a demesne limit, and exceeding it causes a penalty to taxes and levies. This limit is what forces kings to distribute power to vassals rather than directly controlling their entire realm. A ruler's demesne limit is based on tier, personal and spouse stewardship, succession type, and centralization law.
When a ruler is over their demesne limit, they suffer penalties due to inefficiency:
- Reduced opinion from vassals (-10 per settlement over limit)
- Reduced demesne levies, except in the capital (-20% per, up to -90% with the 5th)
- Reduced demesne income (-20% per, up to -90% with the 5th)
- Reduced tax from vassals (-20% per, with no cap)
There is a 2-month grace period when a ruler goes over their limit due to acquiring new titles. However, if a ruler goes over their limit due to a reduction in stewardship skill, the penalties kick in immediately.
The demesne limit is (the notation refers to rounding down to the nearest integer):
Each rank has a base demesne value:
|Great Duke||2||A "Great Duke" is a Duke with 2 or more duchy titles.|
Patricians have different base demesne sizes than feudal lords. The base is 2 for a patrician and 3 for a doge, no matter what rank title they hold.
The stewardship bonus is (in case of polygamy, only the primary spouse's stewardship is used):
Here is a table of the values required to achieve a certain increase in demesne limit relative to the limit you would have without Gavelkind and with 0 stewardship (note that this is different from the stewardship bonus, since the actual stewardship bonus is multiplied by 1.3 in the case of Gavelkind):
This table can be computed using
Tribal rulers get a +2 bonus to their demesne, at a cost of -10 to their vassal limit.
Centralization Bonus depends on the Centralization law, available to dukes and above:
|Level||Decentralized||Low Centralization||Medium Centralization||High Centralization||Centralized|
The in-game tooltip breakdown may be confusing, as values are rounded as integers for display, but formula uses float values behind.
Here's an example illustrating the tooltip discrepancy for a king with 12 stewardship married to a wife with 9 stewardship under gavelkind succession:
- Rank Base Demesne: 3*1 = 3, displayed as +3
- Stewardship Bonus: 0.15 * (12 + 0.5*9) = 2.4, displayed as +2
- Gavelkind: 30% * 5.4 = 1.6, displayed as +1
- Total: 3 + 2.4 + 1.6 = 7, displayed as +7 and not +6
Wrong settlement type
Characters get a 75% penalty to income and levies in demesne settlements that do not match their government type. These settlements should generally be given to a vassal of the correct type or to a courtier (who will automatically take on the correct type).
- Tribal rulers can only hold tribes without penalty
- Nobles can hold castles and tribes of their culture
- Patricians can hold cities and castles
- Muslim nobles can hold mosques, and gain extra piety if they do. Muslim patricians can no longer hold mosques without penalty.
- Nomads cannot hold any settlement without penalty except their nomadic capital.