This EU5 subjects guide is written for patch 1.4, with subject mechanics verified against the current wiki. Picking the wrong subject type is how you end up with a realm that collapses the moment you look away. Picking the right one is how you play wide without drowning in loyalty problems.

Source: Paradox Interactive, official EU5 Steam screenshot

The three subject types, plainly explained

A subject is a country subordinate to you, and one country can itself rule subjects, so chains form naturally. Every subject type shares a baseline: +10% estate satisfaction equilibrium, slower pop assimilation and conversion, and a lower chance of pops joining a rebellion. The differences come from the type.

Vassals are the traditional subject. They are separate countries with their own ruling families, they pay fees, they join your wars, and they give you monthly prestige. Their loyalty is calculated separately from other types, and if it drops low enough they can try to break free.

Fiefdoms are extensions of your rule. They inherit your laws, societal values, and estate privileges, which usually keeps their loyalty higher, and they cannot declare independence directly. They get institution spread much faster than vassals, but they cannot be created by diplomatic offer and they give no monthly prestige.

Dominions are the wide-play answer. They join your wars, cost very little diplomatic capacity, and are built to stay long term, with annexation effectively off the table for a century. If your plan is to control a huge chunk of the map without micro-managing a dozen small states, dominions are the tool.

What changed in 1.3: the vassal spam meta is over

The old playstyle was simple: stack subjects, stack prestige, absorb them later. The current game punishes that approach. Loyalty is global pressure, not per-subject slack. Every subject type adds to the pressure your realm feels, and subject taxation plus great power extraction mean a swarm of tiny vassals costs you in ways the old guides never mentioned.

Reading the pre-1.4 guides online, you will see pages still treating fiefdoms as exotic and dominions as irrelevant. Both are wrong now. Fiefdoms are the everyday integration tool, and dominions are the machine that lets a wide empire run at all. If you are playing tall, none of this matters as much. If you are playing wide, subject type choice is half your campaign.

Head-to-head comparison

	Vassal	Fiefdom	Dominion
What it is	Separate country, own ruler	Extension of your rule	Long-term subordinate realm
Joins your wars	Yes	Yes	Yes
Monthly prestige	Yes	No	No
Institution spread	20%	50%	High
Independence risk	Can break free at low loyalty	Cannot declare independence directly	Low
Created diplomatically	Yes	No	Via conquest
Annexation	After 10 years and high opinion	After 10 years and high opinion	Effectively unavailable for a century
Diplomatic capacity cost	Full	Full	Half

Decision matrix: annex vs colony vs buffer vs swarm

Source: Paradox Interactive, official EU5 Steam screenshot

Use fiefdoms when you want quick integration or a short-term holding. They inherit your laws and convert culture and religion faster, and integrating one uses a diplomatic option instead of a dedicated cabinet seat action.

Use vassals when you want monthly prestige, a buffer state, or a standing military contributor. They are also the better pick for distant development, because their higher independence does not hurt you if they are far from your core.

Use dominions when you are playing wide and want permanent, low-maintenance subjects. They get to join wars and cost half the diplomatic capacity, and the century-long annexation floor is a feature, not a bug, for a subject you plan to keep.

Mix deliberately. The confirmed reason is simple: loyalty problems in one subject type do not spill over into another. A vassal that hates you will not drag your fiefdoms into rebellion, so a mix lets you run a larger subject swarm safely. The general pattern that works: strong nations as vassals, weaker ones as fiefdoms, and the far-flung pieces as dominions.

Managing loyalty (the part everyone gets wrong)

Loyalty runs from 0 to 100, and the line that matters is 50. A subject under 50 loyalty stops joining your wars and cannot be annexed. That single threshold is why the classic mistake, ignoring loyalty until a war starts, fails so hard.

Two confirmed mechanics drive it. First, Liberty Desire, which swings between +100 and -100 and drifts toward 0 each month, costs you one loyalty point per point of desire. Second, loyalty moves at a rate equal to 15% of the subject’s opinion of you. So opinion work, the same diplomacy you use on foreign powers, is the lever for keeping subjects in line. Relative power matters too: a subject that dwarfs your own strength is always going to be harder to hold.

The practical rule: check the subject screen before wars, not during them. If a subject sits at 60 loyalty and you call it into a long war, one bad peace can push it under the line and it will sit out the fight that matters.

Integration and annexation timing

Annexation has two hard gates: time and opinion. Vassals and fiefdoms require roughly 10 years of subjecthood and a high opinion (around 150) before integration is available. Fiefdoms get a real advantage here because integrating one uses the diplomatic path rather than tying up a cabinet seat.

Dominions invert the schedule. Their annexation floor is around 100 years, which reads as impossible and is meant to be. If you created a dominion, you committed to keeping it. Plan your subject list around that fact: dominions for permanence, vassals and fiefdoms for the shorter game.

FAQ

Are vassals or fiefdoms better?

It depends on the job. Fiefdoms integrate faster and convert faster, vassals pay prestige and are the safer distant-development choice. For a mix-heavy campaign, run both so loyalty problems stay separate.

What is a dominion for?

Wide play. They join your wars, cost half the diplomatic capacity, and are built to stay put, with annexation effectively locked for a century.

What happens below 50 loyalty?

The subject stops joining your wars and cannot be annexed. Keep every subject above that line before you start a conflict.

What should I read next?

See which starting nations suit wide play, how government types change what you can do with subjects, and our diplomacy guide if you want the relationship side of the game.