A Persian Magian, worshipping at a fire altar

However, it is equally certain that Alexander destroyed Zoroastrian sanctuaries, persecuted priests, and destroyed religious writings. According to one source, the "accursed Alexander" also "slew those who went in the garments of Magians" (go here for three texts on the subject). It seems that many Zoroastrians fled to Drangiana where they taught each other what they remembered of the correct rituals