Holy Roman Empire modding

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The Holy Roman Empire is a unique mechanic which uses a large range of files to implement. There may only be one Holy Roman Empire in a game, though use of localisation files can disguise it as something else.

Adding/Removing provinces in the Empire

Provinces can be set as part of the HRE by navigating to /Europa Universalis IV/history/provinces and opening the respective country file. To add the province to the Empire, it the history file should contain the line:

hre = yes

If you want a province to be added to the HRE only on certain bookmarks, you can start with

hre = no

and then add a date for the province to be added to the empire, for example:

1464.1.1 = { hre = yes }

Setting Electors

To set a country as an elector, navigate to /Europa Universalis IV/history/countries, go to the respective country and add the line:

elector = yes

You can make this status only appear on certain bookmark by setting a date, for example:

1701.1.18 = { elector = yes }

The number of electors is found in the /Europa Universalis IV/common/defines file, and has the initial value:


The first number represents a soft limit on the number of electors in the game; if the game already has seven electors, no more will be added. The second number represents a hard limit on the number of electors.

You can increase the soft limit with the command

max_electors = 1

This is used by the imperial reform 'Embrace Rechenschaft Measures'. You cannot increase this soft limit past the hard limit.

Setting the Emperor

The emperor is defined in the /Europa Universalis IV/history/diplomacy/hre file. For example, the code

1437.12.9 = { emperor = HAB }

defines HAB (Austria) as the Emperor after the 9th of September 1437.


The Holy Roman Empire's default religion is defined in the /Europa Universalis IV/common/religions/00_religion file. The default religion should have the line:

hre_religion = yes

By default this is the Catholic faith. The religion considered the main heresy (which can produce league wars) should have the line:

hre_heretic_religion = yes

By default this is the Protestant faith.

Imperial Reforms

Imperial Incidents

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