The Muslim conquest of Persia (637–651) led to the end of the Sasanian Empire and the eventual decline of the Zoroastrian religion in Iran (Persia). Islam has been the official religion of Iran since then, except for a short duration after the Mongol raids and establishment of Ilkhanate. Iran became an Islamic republic after the Islamic Revolution of 1979 which ended the Persian monarchy.
Before the Islamic conquest, the Persians had been mainly Zoroastrian; however, there were also large and thriving Christian and Jewish communities, especially in the territories of at that time northwestern, western, and southern Iran, mainly Caucasian Albania, Asōristān, Persian Armenia, and Caucasian Iberia. While a significant number of Iranians also adopted Buddhism in eastern Iran such as Bactria and Sogdia.
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