Vassal wars

[StarNate]

I know in CK2 I could just make the realm laws that they can make their own wars of expansion outside of the realm, but I see no options for this in CK3....How do i let my vassals go after their own wars?

[SDxEair]

They already can. Some personalities don't seem to do it very often though.

[Talist]

By default, they can. Having high or absolute crown authority prevents internal wars between vassals, but vassals can attack outside realms whenever. They usually don't unless they're quite confident through.

[dbix11]

I had one vassal that was a work horse in terms of expanding my domain.

[StarNate]

So far, I have yet to have any vassal expand on their own, regardless of where i play, and im always ironman/achievements on, so it's not like im on super easy or anything

[Genghis San]

I see them do this. Not very often but that is probably because often (I play a lot in Central Europe) my Kingdom directly borders another Kingdom. And I don't think my vassal duchies are allowed to attack a vassal belonging to another Kingdom. But if independent counties appear at my borders, my vassals do not hesitate to expand if they have a CB (and if I don't beat them to it).

[CrUsHeR]

This is determined by the Crown Authority realm law.

https://ck3.paradoxwikis.com/Laws#Authority

Basically the third level prevents internal wars, and the fourth level prevents external wars as well.

Additionally there's a vassal contract option for sanctioned war declarations, completely negating the authority law for vassals with this type of contract.



Note that Crown Authority only affects your direct vassals. If you want this to affect all realms in the hierarchy, there's this mod

https://steamcommunity.com/sharedfiles/filedetails/?id=2692957667

It also has a game setting to make Tribal Authority work the same way.

[TurksTeeTime]

Couple of things to encourage this:

1) give them vassals more land. If they are stronger, they will attack their neighbours. If they are full on personal holdings, I find they wont. Find the sweet spot. Giving them a duchy that you dont have all of will give them the CB for the missing land
2) give them your extra monies. Money is part of the AI declaration criteria as it will factor in possible merc hires.
3) Reform your faith to give them more targets for Holy War