This article is accurate for the latest versions of EU3, Napoleon’s Ambition, In Nomine, Heir to the Throne and Divine Wind.

Missionaries are agents used to convert the religion of an owned province. For a fee (as well as monthly upkeep), Missionaries will attempt to convert the populace to the state religion — though their behaviour will stir up the populace, increasing local revolt risk. No improvements may be constructed while a Missionary is active in a province.

Benefits of converting a province

• Lower Stability Cost
• Higher tax income. (lose 30% penalty for different religion in province)
• Higher Population growth
• Lower Revolt Risk (If converting from another religion (ex. Christian to Muslim)
• Allows the province to begin cultural assimilation (If Core)
• Converted pagan or animist provinces get your culture.
• Preventing your neighbours from getting a mission to save the province from the heathens. (Only if the neighbour have the "original" faith).

Number of Missionaries per year

• State religion
  • Catholic, Orthodox, Sunni and Shiite: +0.25/year
  • Protestant, Reformed, Hindu, Buddhist, Confucian and Shinto: +0.2/year
• Domestic Policy
  • Narrowminded: up to +1/year (Innovative results in up to -1 per year)
• National Ideas
  • Divine Supremacy: +0.5/year
• Triggered Modifiers
  • The Conquest of Mecca: +0.5/year
  • The Conquest of Jerusalem: +0.5/year
  • The Conquest of Rome: +0.5/year
  • The Pentarchy: +0.5/year
• Various Decisions#Religious decisions

Missionary success chance

• State religion
  • Animism and Shamanism: +16.7%
  • Hinduism: +11.7%
  • Catholic, Orthodox, Protestant, Sunni, Buddhism +10%
  • Reformed, Shiite +9%
  • Confucianism and Shinto: +6.7%
• Ruler's Administrative skill:+0.7% per star
• Theologian advisor +1% per star
• Fort level (LV1: +0,7%, LV2: +1,4%, LV3: +2%, LV4: +2,7%, LV5: +3,7%, LV6: +4%
• Religion converting from Sunni and Shiite: -4%, Shinto: -4%
• Theocracy government type: +10%
• Non-accepted culture: -1.7%
• Base tax value of the province: -0.7% per base tax
• Various religious decisions and events
• Cathedral building: +1%

Before In Nomine

The system of missionaries changed a lot with the In Nomine expansion. In EU3 you paid for sending a missionary, and either he converted the province or you got a revolt. With In Nomine, you send the missionary and he works there until he is successful.

Missionary success chance

The chance of success for a missionary depends on several things:

• Monarch ADM rating gives 4% bonus for each skill level
• Theologian advisors (+2% chance per level)
• Province tax gives 2% penalty for each ducat tax
• Non-accepted culture gives a 5% penalty
• Lucky countries have a 10% bonus
• Prestige gives 0.1% bonus for each positive prestige point
• Prestige gives 0.1% penalty for each negative prestige point
• Fortifications give 2% bonus/fort level
• Religious tolerance province effect gives a 15% bonus
• Theology province effect gives a 15% bonus
• State religion bonuses:
  • Catholic: 30%
  • Protestant: 30%
  • Reformed: 27%
  • Orthodox: 30%
  • Sunni: 30%
  • Shiite: 27%
  • Buddhism: 30%
  • Hinduism: 35%
  • Confucianism: 20%
  • Shintoism: 20%
  • Animism: 50%
  • Shamanism: 50%
• Government type bonuses:
  • Theocracy: 25%
  • Papacy: 30%

Missionary cost

The cost of a missionary depends on several things:

• Overseas provinces cost 75% more
• Province tax gives 1% increase for each ducat tax
• Province population gives 1% increase for each 1000 people
• Inflation increases cost 1% for every 1% inflation
• Religious intolerance province effect gives a 25% decrease
• Convert heretics province effect gives a 5% decrease