A project is underway here.Is there a way to use this map from the Charlemagne start Date?
Argument for making Castile a duchy: It historically controlled an amount of land that was called "duchy" in most of Europe.This is regarding why the holder of the Castile title is called a count but holds a duke-tier title.
A suggestion: Just make the title a county, rather than a duchy.
Argument for making Castile a county: It historically was called "county".
Simple solution: Keep Castile as a duchy-tier title, but give it a modifier that decreases prestige so that, overall, the Count of Castile gains only the amount of prestige that's associated with a count-tier title.
Normally, a duke gains 0.2 prestige per month, while a count gains 0.05 prestige per year. The Counts of Castile could get a modifier that gives -0.15 prestige per month, to simulate how they're called counts despite actually being dukes. Likewise, a king normally gains 0.4 prestige per month, so the Anglo-Saxon petty kings could get a modifier that grants 0.2 extra prestige per month, in order to represent how they considered themselves kings despite actually being mere dukes.
This character modifier would have to be added and removed by event, based on titles and ruler cultures.
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