Culture, Language, and Integration in EU5

Conquering land in EU5 is the easy half. The hard half is that the land arrives full of people who aren’t yours — different cultures, different languages, often a different faith — and the game prices every possible relationship you can have with them. This page covers the three pricing systems: culture status, language power, and integration cost. (Religion has its own page; population mechanics live in the pops guide.)

The four culture statuses

Every culture in your realm holds one of four statuses, each a bundle of satisfaction, military access, and cost:

Primary — your state culture. Full satisfaction bonus, full levy access, cannot be changed.

Accepted — the inner circle. Satisfaction bonus, levies available. Upgrading a tolerated culture to accepted is priced in government power (base 50) and gated by the culture-conversions game rule.

Tolerated — recognized but outside. A smaller satisfaction bonus, levies only through special laws. Reaching tolerated from discriminated requires the culture to matter demographically — a million people or 1% of your population — and costs a little prestige.

Discriminated — the default for the conquered. Zero satisfaction contribution, no levies without special laws.

Two numbers around the edges do most of the strategic work. Downgrading a culture out of acceptance hits every pop of that culture with −50% satisfaction — a self-inflicted unrest bomb, which is why demotion is an emergency tool. And promotion is gated by opinion: only cultures at neutral or better toward your primary culture can climb at all.

Culture capacity: the budget for empires

You can’t accept everyone. Culture capacity is the budget, and costs scale on two axes: an accepted culture costs three times what a tolerated one does, and each culture’s bill is scaled by its size relative to your primary culture and by its opinion tier:

Read as strategy: expansion into kindred cultures is subsidized — their pops arrive happier, their acceptance costs a quarter of the budget, and the countries sharing them like you more. Hostile-culture conquest is the opposite on every line, and since negative-tier cultures can’t even be promoted, your options there are assimilation or the vassal route (below). Exceeding capacity stacks penalties per point over the line; the wiki’s exact penalty table is one of the values we’ll publish after file-level verification rather than approximate.

Languages: the layer everyone skips

Separate from culture, every country designates languages for roles — court, liturgical, common, market — and each language has a global language power, measured relative to the world’s strongest (Mandarin, in 1337). Power flows from everyone using it: clergy populations where it’s the liturgical language, the political power of primary-culture pops where it’s the court language (scaled by country rank), trade capacity and market advantage where it’s the common or market tongue, plus the cultural influence of its cultures.

Why care: a high-power liturgical language speeds your research, and a high-power court language raises noble satisfaction. This is the quiet argument for staying inside great ecumenes — a small Catholic power’s Latin liturgy is drafting off a continent’s clergy — and it’s half of what the Ottoman “Persianate Bureaucracy” event is really asking you to price when it offers a Greek court.

Integration: pay by the location, not the map

The union-and-subject endgame — annexation — is priced per location, and the community-derived formula is blunt: cost = 10 ÷ (1 + the location’s integration-speed modifier), with the modifier floored at −99%. Worked examples from the wiki’s documentation: a town at +25% speed ≈ 13.3, a city at −50% ≈ 20, a megalopolis at the floor = 1,000.

Three consequences worth planning around:

1. Speed modifiers are the whole game. Everything that raises integration speed — diplomats on the job, relevant advances, the subject’s opinion of you — divides the bill before you pay it. Stack first, integrate second.
2. Urbanization is a tax on annexation. Countryside-heavy subjects fold in cheaply; the rich city-state you’re proudest of vassalizing is the one you may never afford to absorb. Sequence accordingly.
3. Sometimes the subject is the plan. Our Ottoman guide’s doctrine — vassalize the Greek-populated lands and let culture-matched subjects convert their own pops — generalizes: a permanent vassal that assimilates for you is often worth more than an expensive annexation that hands you an integration problem.

Common death spirals