Is it possible to change a title's prefix using a decision?

[lothar_82]

I've been trying to create a title decision that would allow me to change a kingdom's prefix to Principality. I haven't been able to get the decision to change the prefix, so any help would be appreciated.

designate_principality = {
    from_potential = {
        ai = no
        independent = yes
    }
    
    potential = {
        real_tier = KING
        holder_scope = {
            same_realm = FROM
        }
        
        NOT = {
            ROOT = {
                has_title_flag = designated_principality
            }
        }
    }
    
    allow = {
        FROM = {
            primary_title = {
                real_tier = EMPEROR
            }
            wealth = 200
            prestige = 500
        }
    }
    
    effect = {
        ROOT = {
            title = KINGPRINCE
            title_prefix = KINGPRINCE_OF
            foa = KINGPRINCE_FOA
            set_title_flag = designated_principality
        }
        
        FROM = {
            wealth = -200
            prestige = -500
        }
    }
}

 

[Whizzer]

You can't change these title aspects this way. Your only bet is using customisable localisation, selecting the desired localisation key depending on which flag is set.

 

[Metanetwork]

I wouldn't recommend customizable localisation for a title's name because the title window does not recognize it. I did not test for customisation localisation in the general localisation for title prefixes l but I would expect the same behavior. However, customizable localisation for character titles seems to work anywhere except on the call-to-war pop-up.

Your goal can possibly be accomplished by swapping the original kingdom title with a dynamic kingdom-tier "principality" title that copies the original title's name, history, laws, de jure vassals and de jure liege. To see how this is done you can read the code that turns the Byzantine Empire (e_byzantium) into the Roman Empire (e_roman_empire). To see how to create dynamic titles based on an existing title's name you can analyze what the devs did in event HFP.42100.