Babak Khorramdin
At the time of the Muslim conquest of Persia, the dominant religion of the region was Zoroastrianism, an Iranian religion that also served as the official state religion of the Sassanid Empire. Many notable Iranian figures, such as Babak Khorramdin, actively rebelled against the Rashidun army and later Muslim caliphates for almost 200 years, while the others chose to preserve their religious identities by fleeing from Iran to India during this time.