What alt history chronicles have y'all run or played in?

So any ST that has run a chronicle that took place outside of the modern nights (whether AOTLGs, Classical ages, Dark Ages, Wild West, Victorian, etc.) knows that it's exceptionally easy for the coterie to do something that would irreparable change the timeline, recently for me it was a player putting a curse on Copenhagen in the year 1250ce driving all the the citizens north in a refugee crisis, which I decided would lead to Jarl Birger Magnusson trying to return to Stockholm to deal with it but being ambushed and killed by Tavastians which caused the 2nd swedish crusade of Finland to fail, and for Finnish paganism to survive a lot longer than in our own.

But what about those games where the ST decides to change the timeline themselves?

Like a one set in the timeline of The man in the high Castle, or one where Napoleon was successful against Russia, or one where abrahamic faiths all died out before the fall of Rome.

What games have y'all traveled with differing timelines to our own?