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This article may contain outdated information that is inaccurate for the current version of the game.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

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 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.

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 Bonus 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 following national ideas increase coring costs for a foreign power if they conquer provinces from a nation which possesses this modifier:

Enemy core creation.png Traditions Ideas Bonus 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. The range is the same as colonial range.
Colonial range.png Traditions Ideas Bonus 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

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.


Province mechanics