During the latter part of the first third of the 2nd/8th century, following a series of revolutions and bloody wars throughout the Islamic world which were due to the injustice, repressions, and wrongdoings of the Umayyads, there began an anti-Umayyad movement in the name of the Household of the Prophet in Khurasan in Persia. The leader of this movement was the Persian general, Abu Muslim Marwazi, who rebelled against Umayyad rule and advance his cause step by step until he was able to overthrow the Umayyad government.
Although this movement originated from a profound Shi'ite background and came into being more or less with the claim of wanting to avenge the blood of the Household of the Prophet, and although people were even asked secretly to give allegiance to a qualified member of the family of the Prophet, it did not rise directly as a result of the instructions of the Imams. This is witnessed by the fact that when Abu Muslim offered the caliphate to the sixth Imam in Medina he rejected it completely saying "You are not one of my men and the time is not my time."