
The option is accessible from the overview tab of the domestic management interface.

One must be at peace to release vassals - wars with Hordes count as war normally. Release vassals is an action that can be undertaken by a nation whose provinces contain cores of nations which don’t exist.

This cost is modified by some rare Casus belli such as Subjugation. This requires a large war score, which appears to be the sum total of the war value of all their provinces - if their entire nation can't be annexed, it can't be vassalized, in other words. If a country is soundly defeated in a war, the victor may demand that the defeated becomes a vassal. The minor nation must have no more than 4 provincesĪlso known as "Force-vassalisation", this option is available exclusively through the Peace negotiation screen.They must belong to the same religious group.They must have very good relations (+190 or better).Before a country can offer another vassalage, there are some requirements that need to be met: If two countries maintain good relations and one is significantly more powerful than the other, the weaker of the two may accept to become a vassal through diplomatic means. There are two ways for a free country to become a vassal of another country: In Europe there is a need to monitor a vassal's religion if it changes during the reformation then alliances are broken and relations are damaged.The vassal may be disloyal and declare war on the overlord, such as when the overlord is currently being mobbed by many other opponents.Other nations can declare war on the overlord's vassal.A vassal can enter royal marriage with their overlord.50% of a Vassal provinces count towards the overlord's support limit.Can be called into war by their overlords, whether the overlord is the alliance leader or not.Since this mechanic was seen as exploitative, the 5.1 patch changes the mechanic by allowing automatic military access through lands of vassals of your enemy. In all versions up to 5.1, vassals would not grant Military access to countries which were at war with the vassal's masters.The vassal cannot enter any other royal marriages.The vassal cannot enter any other alliances.50% of the vassal's monthly tax revenues go to its overlord.Note: These are considered from the overlord's point of view rather than the vassal's Benefits
