Want a chance to win a copy of Art of War, CKII, HoI3 Collection, or EU4+Conquest of Paradise? Check out the wiki's contest.


From Europa Universalis 4 Wiki
(Redirected from Cores)
Jump to: navigation, search

This article may contain outdated information that is inaccurate for the current version of the game. It was last updated for 1.1.

A core is a province that is considered a rightful part of your state. Cores give several strategically important benefits:

  • Provinces without a core add to your overextension (unless it's an overseas colony), proportional to their tax base value.
  • Core provinces get a +75% positive tax modifier.
  • Provinces with cores will have lesser chances for revolts.
  • You always have a casus belli if one of your core provinces is owned by another power.

Core Icon.png Requirements[edit]

Core Icon.png Coring[edit]

Coring is the act of adopting a province into what is considered one's patrimony, or rightful homeland. Cored land is not considered conquered or occupied but rather a rightful part of a realm.

Colonial range.png Range[edit]

  • Usually coring range is the same as colonial range.

Following ideas and policies increase colonial range.

Colonial range.png Traditions Ideas Bonuses Policies

Exploration Ideas 3: Overseas Exploration

Norwegian Ideas 4: The Call of our Forefathers

Portuguese Ideas 2: Legacy of the Navigator

Exploration-Maritime: The Naval Exploration Act

Couronian Ideas 5: Couronian Colonization

Exploration-Plutocratic: The Colonial Companies Act
Naval-Exploration: Skilled Cartographers
  • If one country has core in province A, then it can core any province that has "land bridge" to A. It don't require A be owned by that country.
  • If one country's vassal has core in province B, then the country can core any province adjacent to B in its home continent. It don't require B be owned by that vassal.
  • If one country's colonial nation has core in province C, then the country can core any province adjacent to C in all continents. It don't require B be owned by that colonial nation

Core-creation cost.png Costs[edit]

Coring is an action which costs administrative monarch points. The amount of points needed and therefore time it takes to core a province depends on:

  • Base cost depends on base tax: for each 1 base tax, the cost is 20 Administrative power.png AMP. (In older patches, provinces with unaccepted cultures cost more; this is no longer the case).
  • An overseas province of your own culture costs 10% of the normal cost to core. Colonies automatically become cores upon completion, so this cost reduction is rarely relevant.
  • War exhaustion increases coring cost by 2.5% per point.

Coring costs do not depend on:

  • Your current overextension.
  • The distance from your current cores.
  • Your current stability.
  • If you are at war or not.

Reducing core costs[edit]

The following national ideas reduce core-creation costs:

Core-creation cost.png Traditions Ideas Bonuses Policies

Ottoman Traditions

Timurid Traditions Administrative Ideas 2: Adaptability
Horde Ideas 5: The Tradition of Conquest
Italian Ideas 7: The Path to Citizenship

Anatolian Beyliks Traditions

Manchu Traditions Granada Ideas 2: Recover Al Andalus
Russian Ideas 1: Sudebnik
Burmese Ambitions

Dai Viet Ideas 5: Don Dien
Divine Ideas 2: Church Administration
Ethiopian Ideas 6: Expansionist Policy
Maratha Ideas 4: Office of the Peshwa
Administrative-Expansion: The Rapid-Integration Act

Costs are also reduced by:

Core cost reduction is capped at -90% (2 AMP Administrative power.png per base tax); it can never be free or instant.

Enemy core creation.pngEnemy core creation[edit]

The national ideas listed below increase coring costs for a foreign power if they conquer provinces from a nation which possesses this modifier. These modifiers are taken into account by the AI when making decisions on which nation to attack.

Enemy core creation.png Traditions Ideas Bonuses Policies

Berber Traditions
Dai Viet Traditions
Aristocratic Ideas 2: Local Nobility
Bohemian Ideas 7: Czech Nationalism
Chickasaw Ideas 4: Unconquered and Unconquerable
Pueblo Ideas 1: Ancient Pueblo Legacy

Rajput Traditions
Cherokee Traditions
Breton Ideas 1: Legacy of Breton Independence
Italian Ideas 3: Italian Aristocracy
Diplomatic-Defensive: The Diplomatic Defense Act

Espionage-Plutocratic: Public legitimacy
Humanist-Administrative: Provincial Autonomy


Coring is not instant. It takes 3 years, not counting any modifiers, to core a province. All the while you still have the overextension penalties to cost of stability and to your revolt risk.

When the province is occupied by rebels or a foreign power, the coring process is halted until the siege is lifted. Coring progress is also suspended when at war with a country which already has a core in the same province. Coring resumes after the war concludes.


It is not possible to core a province

  • while being at war with someone who also has a core in that province. The ongoing core creation will temporarily halt if this happens.
  • while there is a missionary converting the province
  • while the culture of the province is being changed
  • if the province isn't in range.
  • Province is occupied (All progress lost)
  • Province is under siege (Progress halts, will resume if siege is lifted)

Gaining cores through other means[edit]

In addition to coring newly acquired provinces manually, a nation can also gain cores by diplo-annexation of vassals or integrating a junior partner of a personal union. Both processes automatically give cores on all provinces of the acquired territory, making the strategy of "feeding" vassals with uncored provinces a viable strategy to save monarch points.

Revoke Core Icon.png Losing cores[edit]

  • When negotiating a peace deal, a core can be removed:
    • Through demanding to 'revoke core'.
    • If you force a nation to 'return core's to a third nation, the nation giving away the province loses the core if the province is not of their primary culture.
  • Cores in uncontrolled provinces will disappear some time after the most recent of these events:
    • The province changed ownership.
    • A war between the current owner and the nation owning the core was fought.
    • The owner of the core lost ownership of the province.
  • The time to lose a core depends on the province's culture relative to the core:[Needs verification]
    • 250 years if the core is the primary tag for the province's culture.
    • 100 years if the core shares a culture group with the province.
    • 50 years otherwise.
    • The time is doubled if the core's owner does not exist.
  • If a country is destroyed, it loses all wrong-culture group cores.
  • Releasing nations will remove cores from releaser if the province is not of their primary culture.


  1. http://www.eu4wiki.com/Government_Type#Monarchies
Province mechanics