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In the fourth Hegira century, there were a lot of religious conflicts between madhab of Shia and Sunni as well as verbal discussion. The Buwaihids rulers were the governors of Iran and formed a government of Shia. Different Islamic religions were fighting with each other because of numerous governments of Buyid dynasty. There were numerous conflicts between Shia and Sunni in the most regions of Iran, especially in Ray. This paper investigates the religious conflicts in Buyid dynasty era in Ray City. So, it investigates the religious beliefs of Buyid dynasty rulers, scholars, and schools in Ray, then discusses about religious sectarians and verbal discussions on the basis of criticizing the refutation texts. Finally, he investigates the policy of Buwaihids rulers.

In the seventh century AD, the Moslem Arabs attacked two of the great empires of the period, The Sassanid Empire in Iran and The Byzantium Empire and conquered vast tracts of land. One of the most important events in this period was the fall of the Sassanid Empire. Historians believe that there are various reasons for the fall of the Southern province of Khuzestan to the invading Arabs The research shall review the historical importance of the Khuzestan province in the South of Iran and the underlying reasons for the fall of the Persian empire due to the conquering of this region .

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