Hello and welcome.
As the title says the story is about alternative history. I've been toying with an idea: What if a Finnish tribe had converted to Christianity and started spreading their faith to all Finns?
I edited the scenario files so Mielus the pagan chief of Tavasts became the catholic duke of Tavastia. I also converted his wife. No other alterations were made.
If I feel like it this might become a mega campaign.
My game version is 2.1b and I'm playing Normal/Normal