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duccen

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So I was playing as the duke of Brittany and somewhere along the way my heir was taught by an Occitan and he adopted that culture. Now I didn't notice before he ascended to power, so I just chose to roll with it. And because of it, I tried to replace all my Breton vassals with Occitan noble men I invited (this was around 1090). Fast forward 70 years and all my vassals were now of Occitan descent, but my people remained Bretons. I am wondering if there's anything I can do to speed up the process or if it just happens at random.
 

Ols

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Happens at random. Incidentally you've drastically lowered your chances of forming the Kingdom of Brittany.
 

unmerged(457738)

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Depends what your goals are in your game. All other things being equal you get a larger demesne, more prestige and more options as a king. Brittany is such a small kingdom that it's pretty much moot in this example, as there's only one duchy and it's small enough to not need the demesne bonus. Either way though, having occitan rulers of breton lands just because one heir converted is fairly non-sensical. If you plan to expand aggressively then it's not a big deal as no matter what 90% of your empire will always be foreign anyway, but if Brittany will be the majority of your lands for the foreseeable future then it will be much easier to get a new breton heir than to convert the entire country to a new culture.
 

Ithvan

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If you're talking about provinces: stewardship.

If you're talking about people, mostly the gregarious and diligent trait.

You can't form the Kingdom of Britanny if you don't have a Celtic culture.
 

NoobRage

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So I was playing as the duke of Brittany and somewhere along the way my heir was taught by an Occitan and he adopted that culture. Now I didn't notice before he ascended to power, so I just chose to roll with it. And because of it, I tried to replace all my Breton vassals with Occitan noble men I invited (this was around 1090). Fast forward 70 years and all my vassals were now of Occitan descent, but my people remained Bretons. I am wondering if there's anything I can do to speed up the process or if it just happens at random.

Your people will only filp culture if there is a neighbouring province of Occitan culture or if you primary title is of Occitan culture and every step of the feudal ladder (PREVPREVPREV) is of that same culture. So either you grab Aquitaine and make all you vassals Occitan or get a neighbouring Occitan province.
 

Kaiser Ludwig

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I THINK that if you make Aquitaine (Duchy) your primary, and then Destroy Brittany and recreate it, it should have the "conquered" tag in it or something similar which should permit the culture switch
 

NoobRage

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I THINK that if you make Aquitaine (Duchy) your primary, and then Destroy Brittany and recreate it, it should have the "conquered" tag in it or something similar which should permit the culture switch

No. The PREVPREVPREV thing needs 3 tiers of rulers (hence PREV 3 times). So you must be a King, and the only Kingdom with Occitan culture is Aquitaine. So the OP must create the Kingdom of Aquitaine if he wishes to spread Occitan culture to all his realm.