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This article may contain outdated information that is inaccurate for the current version of the game.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 1.10.

For information on individual religions, see religions and denominations.
Religion interface

The religion that a nation follows and how tolerant it is of other faiths is an important aspect of gameplay in EUIV. Religion will affect diplomatic actions and nations of mutually accepted religions have a better chance of reaching agreements with one another. Religion is also connected to unrest and provinces of non-tolerated religions are more rebellious. The player has some control over religion by having the option to change the state religion, religious decisions that may impact internal and external religious relations, and sending missionaries to convert heathen or heretic provinces to the state religion.

Religion map[edit]

Religion by province in 1444 (as of Common Sense).

Religious unity.pngReligious unity[edit]

Religious unity is the percentage of a country's development provided by provinces that follow the state religion or a positively tolerated heretic or heathen religion.

  • Provinces of the state religion always contribute 100% unity regardless of tolerance.
  • Provinces of a heretic or heathen religion contribute a percentage determined by how tolerated they are.

The effects of tolerance on religious unity per province are as follows:

Tolerance Contribution
Negative Tolerance +0%
0 +25%
1 +50%
2 +75%
3 +100%

For example, suppose a Catholic country has a 10 development Catholic province, a 4 development Protestant province, and a 16 development Sunni province. If heretic tolerance is +1 and heathen tolerance is -2, the country's religious unity will be (100%*10 + 50%*4 + 0%*16)/(10 + 4 + 16) = 40%

Ideas and policies which increase religious unity:

Religious unity.png Traditions Ideas Bonuses Policies

  • Bengali idea 1: Bengali Hindu-Sufi Syncretism
  • Gujarati idea 1: Garba!
  • Indian Sultanate idea 1: Tolerate the Idol Worshipers
  • Jaunpuri idea 3: Sants and Sufis

  • Mughal idea 1: An Indian Padishah

  • South Indian traditions

  • Sami traditions

  • Bosnian traditions
  • Granadan traditions
  • Papal traditions
  • Punjabi traditions
  • Humanist idea 1: Tolerance
  • Bahmani idea 2: Legacy of Gisu Daraz
  • Hessian idea 3: Welcome the Reformers
  • Kazani idea 1: Steppe Tolerance
  • Permian idea 6: Komi Tolerance
  • Zaporozhian idea 6: Steppe Tolerance

  • American traditions
  • Ayutthayan traditions
  • Vijayanagar traditions
  • Javan idea 1: Candi Shrines
  • Karamanid idea 6: Home of the Whirling Dervishes
  • Taungu idea 3: Nat Worship
  • West African idea 4: Ancestors and Crescent
  • Defensive-Religious: Edict of Expulsion
  • Humanist-Aristocratic: Enlightened Aristocracy
  • Religious-Diplomatic: Policy of Calculated Delay
  • Religious-Offensive: The Anti-Heresy Act

  • Smolenskian idea 1: Smolenskian Resolve

  • Central Indian idea 2: Tribal Religion
  • Pueblo idea 6: Clown Societies
  • Exploration-Religious: Colonial Restrictions

Religious unity directly affects the following:

  • for each percentage point of religious unity:[1]
Monthly fervor increase.png +0.01 Monthly fervor
  • for each percentage point of religious unity below 100%:[2]
Stability cost modifier.png +1.0% Stability cost modifier
National unrest.png +0.03 National unrest
Church power modifier.png −1.0% Church power
Devotion.png −0.01 Yearly devotion


Countries have three tolerance values. These tolerance values are national, but have provincial effects depending on the province's religion, relative to the state religion.

Each point of positive tolerance gives:[3]

Local unrest.png −1 Local unrest

Each point of negative tolerance gives:[4]

Local unrest.png +1.25 Local unrest
Local tax modifier.png −10% Local tax modifier
Local goods produced modifier −10% Local goods produced modifier

Note that Hungary and the United States of America have national ideas which remove all penalties for having negative tolerance.

Tolerance own.pngTolerance of the true faith[edit]

This refers to the state religion. For example, if the state religion is Catholic, Catholic provinces will use this tolerance value. The base value of Tolerance of the True Faith is +3, and there is no maximum value.

Ideas and policies that affect tolerance of the true faith:

Tolerance own.png Traditions Ideas Bonuses Policies

  • Byzantine traditions

  • Ladakh traditions
  • Lan Xang traditions
  • Laotian traditions
  • Leonese traditions
  • Québécois traditions
  • Romanian traditions
  • Sukhothai traditions
  • Tapuian traditions
  • Bremish idea 2: Memories of Verden
  • Cham idea 1: Memory of the My Son Temples
  • Danish idea 7: Religious Freedom is Atheism
  • French ducal idea 4: Religious Conviction
  • Fulani Jihad idea 5: Islamic Scholarship
  • Greek idea 1: Greek Orthodox Faith
  • Hejazi idea 1: Custodian of the Two Holy Cities
  • Lan Na idea 4: The White Elephant
  • Manipur idea 4: Mayek
  • Medri Bahri idea 2: Christian Legacy
  • Miao idea 1: Sacrificing to the Spirits
  • Mossi idea 6: Honoring the Masks
  • Münster idea 1: Great Procession
  • Najdi idea 7: Enforce Tawhid
  • Northumbrian idea 3: Cradle of British Christianity
  • Orleanaise idea 5: The Cathedral of Orleans
  • Papal idea 1: Ecclesiastical Primacy
  • Pegu idea 3: Dhammazedi
  • Pueblo idea 6: Clown Societies
  • Sami idea 5: Defend the Noaidi Traditions
  • Songhai idea 6: Sharia
  • Transylvanian idea 6: Unitarian Zeal
  • Yarkandi idea 4: Empower the Khojas
  • Yi idea 5: Promote the Bimoism

  • Religious idea 5: Devoutness
  • Croatian idea 4: Antemurale Christianitatis
  • Kanem Bornuan idea 4: House of Kanem
  • Khmer idea 2: Theravada Buddhism
  • Kievan idea 5: Center Of Orthodox Church
  • Montenegrin idea 2: Metropolitanate of Montenegro
  • Ruthenian idea 7: Birth of Russian Orthodoxy
  • Swahili idea 3: Great Mosque of Kilwa
  • Teutonic idea 7: One State, One Religion
  • Theodorian idea 7: Cave Monasteries
  • Vindhyan idea 3: A Sacred Land
  • Welsh idea 7: Welsh Church

Tolerance heretic.pngTolerance of heretics[edit]

This refers to different religions within the same religious group. For example, if the state religion is Catholic, the religion group is Christian, and provinces that are Protestant, Reformed, Coptic, or Orthodox will use this tolerance value. The base value of Tolerance of heretics is –2. The possible maximum value is +3.

Ideas and policies that affect tolerance of heretics:

Tolerance heretic.png Traditions Ideas Bonuses Policies

  • Lithuanian traditions

  • Bosnian traditions
  • Dali traditions
  • Humanist idea 3: Ecumenism
  • Bohemian idea 1: Compacta of Prague
  • Dutch idea 5: Embrace Humanism
  • Knights Hospitaller idea 5: Ecumenical Defenders of Christendom.
  • Saxon idea 4: Wittenberg University
  • Transylvanian idea 5: Patent of Toleration
  • Polish ambitions

  • Baden idea 4: Cuius Regio, Eius Religio
  • Burgundian idea 6: Allow Freedom of Worship
  • Canadian idea 5: The Quebec Act
  • French idea 7: Liberté, Égalité, Fraternité
  • Kurdish idea 2: Li Gora Gawirî Kurd Misilman e
  • Pomeranian idea 4: Religious Freedom
  • Ruthenian idea 2: Foreign Influences
  • Swiss idea 5: Swiss Tolerance
  • Thüringian idea 3: Protector of Reformers
  • Palatine ambitions
  • Religious-Plutocratic: The Tolerance Act

  • Albanian idea 6: Albanian Tolerance
  • Arawak idea 4: Tribal Tolerance
  • Circassian idea 7: Religious Flexibility
  • Prussian idea 7: Religious Toleration
  • Tibetan idea 4: The Way of Virtue
  • Vijayanagar idea 4: Tolerance

Heretic conversion events[edit]

Tolerance of heretics of ≥ 2 will allow provinces to randomly convert to those heretic religions. The median time to happen is 5000 months, lowered by Innovative Ideas and having a neighboring province with the new religion while increased by having the Theocracy government type. Provinces with the "Religious Zeal" modifier will not receive these events at all.

A province is more likely to convert via event to a particular religion if a neighboring province has that religion. Adjacency is not required for most conversions. However, the following conversions only occur if a neighboring province has the new religion:

  • Orthodox <-> other Christian
  • Buddhism, Shinto -> Confucianism

In addition, only Japanese-culture provinces can convert to Shinto.

Tolerance heathen.pngTolerance of heathens[edit]

This refers to religions of other religious groups. For example, if the state religion group is Christian, provinces that are of Muslim, Eastern, or Pagan religious groups will use this tolerance value. The base value of Tolerance of heathens is -3. The possible maximum value is +3.

Ideas and policies that affect Tolerance of heathens:

Tolerance heathen.png Traditions Ideas Bonuses Policies

  • Bahmani traditions
  • Bengali traditions
  • Gujarati traditions
  • Indian Sultanate traditions
  • Jaunpuri traditions
  • Ottoman traditions
  • Semien traditions
  • Humanist idea 7: Humanist Tolerance
  • Granada idea 1: People of the Book
  • Mughal idea 1: An Indian Padishah
  • Siddi idea 1: Goma

  • Javan traditions
  • Kazani traditions
  • Malian traditions
  • Pagarruyung traditions
  • Permian traditions
  • Punjabi traditions
  • Arakanese idea 2: Rohingya Immigrants
  • Carib idea 6: Religious Syncretism
  • French idea 7: Liberté, Égalité, Fraternité
  • Guarani idea 4: Jesuit Conversions
  • Kutai idea 2: Muslim Trading Communities
  • Laotian idea 3: Satsana Phi
  • Malayan sultanate idea 2: Sufi Legacy
  • Omani idea 3: Association With Unbelievers
  • Sadiyan idea 2: Crossroad of Religions

  • Jerusalem traditions
  • Albanian idea 6: Albanian Tolerance
  • Circassian idea 7: Religious Flexibility
  • Tibetan idea 4: The Way of Virtue
  • Vijayanagar idea 4: Tolerance
  • Humanist-Exploration: Native Assimilation Act

Become Defender of the Faith.png Defender of the Faith[edit]

Each Christian or Muslim denomination can have one Defender of the Faith. It costs 500Gold Icon.pngducats for a country to claim the title. Countries with female rulers or regencies cannot claim the title. Being Defender of the Faith gives the following modifiers:

Morale of armies.png +5% Morale of armies
Morale of navies.png +5% Morale of navies
Technology cost.png +5% Technology cost
War exhaustion.png −0.025 Monthly war exhaustion
Papal influence.png +1 Yearly papal influence
Prestige.png +1 Yearly prestige
Missionaries.png +1 Missionary
Devotion.png +0.5 Yearly devotion

Countries automatically call the Defender of the Faith of their religion to arms if attacked by a nation of another religion. Since patch 1.8, it seems the Defender of the Faith gets a call to arms only for countries on the same continent or sharing their border. The Defender of the Faith doesn't get a call to arms if the country attacked is a co-belligerent (e.g., if France is the Catholic Defender of the Faith and Venice (Catholic) is allied with Serbia (Orthodox), then if Ottomans (Sunni) attack Serbia and make Venice co-belligerent, France doesn't get a call to arms).

The Defender of the Faith loses the title, but no prestige, if they refuse or lose the war.


Province conversion[edit]

The most common way to convert provinces is the use of missionaries, but there are also several other methods.

Missionaries.png Missionaries[edit]

Missionaries are envoys that can convert a province to a nation's official religion. Missionaries slowly convert provinces over time: each month, the effective missionary strength in that province is added as ongoing progress, and when it reaches 100% the province is converted. If strength is insufficient, the province will never convert (although the missionary will not lose progress). An active missionary in a province will increase the unrest there by +6%.[5]

Each country has 1Missionaries.png missionary by default. More can be obtained through the following:

Missionaries.png Conditions
+1 for being Become Defender of the Faith.pngdefender of the faith.
+1 with the triggered modifier: The Conquest of Mecca.
+1 with the triggered modifier: Custodian of the Holy Cities.
+1 with the triggered modifier: The Conquest of Jerusalem.
+1 with the triggered modifier: The Conquest of Rome.
+1 with the triggered modifier: The Pentarchy.
+1 with Parliament.pngParliament and Propagation of State Religion as active issue.

Ideas and policies:

Missionaries.png Traditions Ideas Bonuses Policies

  • Divine traditions
  • Spanish traditions
  • Religious idea 2: Missionary Schools
  • Ajuuraan idea 3: Gareen Imams
  • Circassian idea 4: Franciscan Missionaries
  • Fulani Jihad idea 1: Wandering Scholars
  • Jerusalem idea 4: Land of the Heathen
  • Münster idea 3: Founding of Monasteries
  • Najdi idea 2: Hanbali School
  • Teutonic idea 6: Promote Prussian Bishops
  • Bremish ambitions
  • Najdi ambitions
  • Northumbrian ambitions

Decisions and events:

Missionaries.png Event modifier Trigger Duration
+2 Counter-Reformation Decision: “Embrace the Counter-Reformation until one of the four “The Counter-Reformation Ends” events.
+1 Melchior Klesl Austrian event: “Melchior Klesl
Option: ‘Such devotion! We have need of this man on the privy council.’
until ruler changes.
Missionary maintenance[edit]

The player can adjust the missionary maintenance cost by a slider on the economy interface between zero and full funding. Reducing the funding reduces missionary strength linearly, up to −2% missionary strength without funding. At full funding the costs of an active missionary are 5Gold Icon.png per year[6]. These cost are increased by 0.5% for every year[7] since 1444, just as advisor cost[8].

Missionary strength.pngMissionary strength[edit]

Base missionary strength is 2% at full funding, scaling down to 0% at no funding. Modifiers that increase strength include:

  • Advisors: +2% from an Inquisitor advisor
  • Stability: +0.5% for each point of positive stability
  • Piety: Up to +3% for Muslim states that are pious
  • Patriarch Authority: Up to +2% for Orthodox states that have Patriarch Authority.
  • Building: +3% for a Cathedral
  • Decisions: A number of national decisions increase (or decrease) missionary strength.
  • Events: Many events give a temporary bonus (or penalty) to missionary strength.
  • Province's current religion: +2% in pagan provinces.
  • Holy Roman Empire: +1% for being the dominant religion in the Holy Roman Empire
  • Converting religions through the Religion tab gives a +10% "Religious Zeal" bonus for ten years, but only to converting heretics, not heathens.
  • Several ideas also affect missionary strength:

Missionary strength.png Traditions Ideas Bonuses Policies

  • Religious idea 4: Divine Supremacy
  • Byzantine idea 7: Restore the Ecumenical Patriarch
  • Colonial idea 3: Religious Outposts

  • Bremish traditions
  • Jerusalem traditions
  • Najdi traditions
  • Armenian idea 1: Apostolic Church
  • Austrian idea 5: Edict of Restitution
  • Divine idea 4: Let No Man Tolerate the Witch
  • Javan idea 3: Dharmasastra
  • Kanem Bornuan idea 4: House of Kanem
  • Moldavian idea 5: Metropolis of Moldavia
  • Nubian idea 5: Nubian Religious Unity
  • Pagarruyung idea 1: Tantric Legacy
  • Palatinate idea 5: Heidelberg Catechism
  • Savoyard idea 4: Crush the Vaudois
  • Spanish idea 2: Spanish Inquisition
  • Sumatran idea 2: Porch of Mecca
  • Teutonic idea 4: Assume Religious Authority

  • Ajuuraan traditions
  • Lan Xang traditions
  • Tibetan traditions
  • Air idea 7: Ineslemen Teachings
  • Arabian idea 4: Spreading the Prophet's Word
  • Athenian idea 6: Preserve Archbishop of Athens
  • Breton idea 4: Breton Catholicism
  • Ethiopian idea 5: The Ark of the Covenant
  • Fulani Jihad idea 3: Fulani Jihads
  • German idea 5: Cuius Regio, Eius Religio
  • Hejazi idea 6: Hajj
  • Khivan idea 4: Djuma Mosque
  • Kievan idea 5: Center Of Orthodox Church
  • Novgorod idea 2: City of Churches
  • Québécois idea 7: Jesuit Missions
  • Sukhothai idea 4: Wat Si Sawai
  • Sami ambitions
  • Religious-Aristocratic: The Witchcraft Act
  • Religious-Diplomatic: Policy of Calculated Delay
  • Religious-Espionage: Enforce Religious Law
  • Religious-Trade: Religiously Sponsored Guilds

In addition, a few ideas specifically affect missionary strength when converting heretics, but have no effect when converting heathens.

Global heretic missionary strength.png Traditions Ideas Bonuses Policies

  • Bavarian idea 4: Establish the Geistlicher Rat
  • Religious-Offensive: The Anti-Heresy Act

  • Religious idea 7: Inquisition
  • Bulgarian idea 2: Root Out the Heresies
  • Finnish ambitions
  • Münster ambitions

  • Kievan traditions
  • Welsh idea 7: Welsh Church

Things that decrease this speed include:

  • Province's current religion: -2% in Coptic, Muslim and Shinto provinces.
  • Province's current religion: -1% in Orthodox and Sikh provinces.
  • Culture: -2% for non-accepted cultures.
  • Trade company provinces get -2% (but don't get the wrong culture penalty, so switching a province in or out of a trade company has no net effect).
  • Provincial development: -0.1% for each point of a province development level.
  • Rome, Mecca and the initial Sikh province (historically Punjab, but in-game potentially any Indian province) get a special -5% Religious Center modifier.
  • Recently converted provinces get -100%, called Religious Zeal for 30 years.

Center of reformation.pngCenters of reformation[edit]

The first three nations to convert to Protestant and the first three to convert to Reformed have a random province designated as a Center of Reformation. These centers of reformation will automatically convert nearby provinces to their religion, unless they are conquered and converted to a different faith. Provinces converted by a center of reformation get the -100% religious zeal modifier to missionary strength in that province for 30 years. Missionaries can work in the same province that is being converted by a center of reformation. Each center of reformation can only convert one province at a time.

National conversion[edit]

There are several different ways a country may change religion.

By decision[edit]

Catholic, Protestant and Reformed Christians can convert among each other through the Religions tab once the Reformation starts. Hindu and Sikhs may similarly interconvert once Sikhism is unlocked.

Conversion is also possible through decision: with the Sword and Crescent DLC, Sunni and Shiite (but not Ibadi) Muslims may convert to the other denomination if both their capital and the majority of their provinces follow the other denomination. Japanese daimyos - but not Japan itself - may convert to Catholicism by decision if the majority of their territories are Catholic; this can happen following certain events in the 16th century.

Countries of other religions cannot convert peacefully, but can change religion due to warfare or rebels.

By event[edit]

Totemist, Shamanist and Animist pagans get events to convert to Catholic, Protesant or Reformed Christianity if they have neighbors of the appropriate denomination and a sufficient positive opinion with that neighbor. Kongo and Ming have special event chains to convert to Catholicism.

Forcing religion[edit]

A nation can force a heretic (but not a heathen) country to change their state religion as part of a peace deal. Without an appropriate casus belli such as "Cleansing of Heresy" or "Religious Conformance" (unique to the Holy Roman Emperor against HRE members), this will have the same war score cost as annexing the nation. When a country is converted this way, only the state religion and the capital province's religion change. It is possible to combine forcing religion with annexation if the country is small enough; this will convert a province for free before annexation.

Enforcing religion[edit]

Once the religion of the Holy Roman Empire has been locked, the emperor can request a prince to change their state religion depending on their opinion of the Emperor. Similarly to when forcing a religion of an enemy country, the prince has its capital converted while the rest of the provinces remained unaffected.

With the Common Sense DLC, suzerains may force their subject nations to change religions if they follow a heretic faith. This gives +50 liberty desire, gradually ticking down.

Rebel conversion[edit]

Nations can support religious zealots in enemy countries. These rebels convert a province's religion to the one they represent when occupation is achieved.

Supporting religious zealots is only possible if the desired religion is present in the target nation and is the likely rebel type in a province with unrest above 0. If there are no such provinces in the target nation, one way to achieve it is to sell the target a province of the correct religion.

Generally the nation will be able to overpower the rebels if left to its own devices, so it is critical to support them militarily. This can be done by declaring war against the target nation using the "Support Rebels" casus belli.

A nation that is broken by religious rebels, or that accepts their demands, will convert to the rebels' religion provided that the rebels' religion is the plurality religion. For most countries, giving in to religious rebels is the only way to change religious group.


  • Base missionary strength is very small compared to modifiers, both positive and negative. This means that conversion will usually either be very fast or impossible. Religious Ideas is often essential for any serious conversion work.
  • Provinces that do not have the state religion generally suffer from low tolerance and also lower the nation's Religious Unity. Therefore, nations with large amounts of wrong religion provinces will have to choose between two main ways of dealing with them- high tolerance or conversion. There are represented by the Humanist and Religious idea groups respectively.


  1. See in /Europa Universalis IV/common/static_modifiers/00_static_modifiers.txt (Static modifiers#Religious unity).
  2. See in /Europa Universalis IV/common/static_modifiers/00_static_modifiers.txt (Static modifiers#Inverse religious unity).
  3. See in /Europa Universalis IV/common/static_modifiers/00_static_modifiers.txt (Static_modifiers#Tolerance).
  4. See in /Europa Universalis IV/common/static_modifiers/00_static_modifiers.txt (Static modifiers#Intolerance).
  5. See in /Europa Universalis IV/common/static_modifiers/00_static_modifiers.txt (Static_modifiers#Active missionary).
  6. See in /Europa Universalis IV/common/defines.lua: MISSIONARY_MAINTENANCE_FACTOR = 5,
  7. See in /Europa Universalis IV/common/defines.lua: ADVISOR_COST_INCREASE_PER_YEAR = 0.005, -- yearly increase in price in percent,
  8. See patch 1.12.
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