Now the title might be a bit misleading and so before you rant about how this is ASB etc. do let me explain my point. I am sure at least some of you would be aware of the Sarmatian idea of the Commonwealth period and so what if a sizeable Zoroastrian population is able to migrate and integrate a sizeable amount of the Polish nobility? Just how much damage, in the long run, would this do for Poland or on the upside how would it leave the Commonwealth in a better position?
 
Sarmatism is just a Romantic nationalist fad.

You need a more ancient PoD than that for a Zoroastrian Poland. Have a resurgent Zoroastrian Persia spread Zoroastrianism everywhere, and it may well stick in some places.
 
Slavic religion was already influenced by Iranian mythology (like concept of dualism), even Slavic word for god (bog) is belived to be of Iranian origin. But still, it is far from classical Zoroastrianism.
 
Have cyrus the great vassalage the Massagetae, covetveting them to Zoroastrianism.

After the Achaemenids collapse you want the Massagetae to go a conquering in the west against the scytians and enforce a Zoroastrian religion on them.

Then you want the scytians to go north and conquer the proto slavic tribes kinda like what the avars did. But unlike them you want the them to enforce Zoroastrianism instead of perun worship. And give them an organized church structure so they will be less tempted to covert Christianity.
 
You need a prehistoric POD for the region and the Slavs in general. By prehistoric, I mean before history started to be recorded there and probably before the Slavic migrations begin to start.
 
You’d need to reach all the way back to Darius’s Scythian Campaign to get a significant Zoroastrian presence near the Slavic urheimat. That kind of PoD butterflies ‘Poland’ as we know it. By the time ‘Poland’ exists, Zoroastrianism is a declining religion from an empire dead three centuries.

That said, you might get some occultish neo-Zoroastrianism in a PLC that survives into the nineteenth century, as a complement or rival to Slavic neopaganism. It would be a very small minority, though.
 
I think that it would be more interesting to see a Europe, which includes Zoroastrian minorities, their connection to the Birth of Jesus could be used to gain some kind of mostly tolerated minority status in Europe.
 
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