By: Mir M.Hosseini
Abu Muslim was the messenger of Ebrahim Imam. He delivered his letters and preached his teachings in Khorasan. Abbasi Caliph Marwan became suspicious of Ebrahim Imam, and tried to contain him. After Imam's suspicious death, as he was probably instructed, Abu Muslim started his liberation movement. His campaign began by setting foot in a village near Marv on April, 29, 747.
After the month of Ramazan of 129 LH, Abu Muslim publicly announced his uprising against rulers of Baghdad. He raised flags considered sacred; called shadow and cloud sent to him by Ebrahim Imam. He thus started his conquest against the Omavi Caliphs on June, 19, 747 on the Fetr Feast.
Unlike usual Omavi style mass prayers, sermons were headed by Soleyman Bin Kasir. Then Abu Muslim distributed food among participants and then he addressed people discrediting the caliph by calling him a jackass. Missionaries had already been sent to all corners of Greater Khorasan such as Kharazm, Balkh, and Marv, thus residents of 60 villages had already offered allegiance to the cause of Abu Muslim whose followers had already put on black cloths as their standard.
Abu Muslim achieved a great success by defeating the great Omavi army in Nahavand in July, 749. The decisive victory was called the victory of victories, setting an example for similar liberation movements. The Abu Muslim movement succeeded in terminating the Omavi Dynasty and installing the Abbasid rule. However, his popularity was viewed as a threat to the second Abbasi caliph, al-Mansour, who had him killed.
It is remarkable that today, followers of the 12 Imam Shia faith awaiting their messiah, claim that the uprising of Imam Mehdi will be started in the same manner by raising sacred flags, and black is somehow Shia national color in Iran.