The role of Zoroastrian in Islamic period of Khorasan

The seventh century AD (first century AD) is the revolution century of the ancient world. It was the time that the Muslim commanders set out to the East and West of the world to develop the Islamic possessions and publish the realm of the sacred precepts of Islam. They conquest many countries and abolished so many administrative and social systems which were popular at that time. They also popularized many new commands and rules among the vanquished countries. This matter caused a huge revolution in the vast area of Asia; particularly the decadence of the empire of Iran was an important issue that time. Gradually, people adopted Islam, but they couldn’t forget easily their ancient Zoroastrian religion and beliefs. The Role of the Zoroastrian and what was the Caliphsof Islam’s attitude about the Iranian’ beliefs and how they faced with this matter, is the main subject of this article. Further efforts will be made on the interacting and dealing with the tough decisions, the Muslimsdefend their beliefs with.