For special Crowns and traits, there are some neat ones I put in there (most of these I want to leave as a surprise

), like for example if you are Harald Tanglehair (who starts with the crown for King of Vestfold), and you lead Vestfold to conquer specific regions of Norway, your character's name will change to Harald Fairhair and he will gain the crown for King of Norway.
There are others like this for Scotland, England, and a couple of other factions.
Along with the changing nickname of Harald Fairhair, there are other leaders who need to "achieve" their historicals nicknames (Alfred wasn't born "the Great" and Edmund was born a Martyr

!)
PS: Edmund doesn't necessarily have to
die to become "The Martyr", otherwise there would be no point in adding it, but you have to get close to death
Upon release I will put out a guide for how to achieve these things, but most of you will be able to figure them out by looking at the traits files