zoroastrian revival

What if Khaydar Al-Afshin, governor of Transoxiana during the early period of the Abbasid Caliphate who was instrumental in the struggle against the northwestern Iranian rebel Babak Khorramdin and the Byzantines in Anatolia, had succeeded in his political struggle against the Abdullah ibn Taher...

Challenge: With a Starting time, between 650s to 1600s, have Persia be divided by a Islamic Shiite Dynasty, and a Zoroastrian Dynasty.

Persia didn't convert to Islam right after the conquest, with Zoroastrianism having a great-ish number of followers until (at least) the 11th Century. Zoroastrian rebellions took place in Tabaristan, where the Caliph had little control and several Zoroastrian dynasties ruled until the 9th...

"In bygone days, all the lands had submitted to the Shah. It came to pass that Eranshahr went to war with the kingdom of the Romans. At first there was complete and total victory, and then chaos. Both kingdoms ended up devastated. The beneficiary was the Arabs. Coming out of the southern lands...