Abu Muslim Al-Khurasani, The Great leader of a revolutionary movement in Khurasan who was born in the city of Isfahan.Abu Muslim was an energetic leader who played a very important role in the establishment of the Abbasid caliphate. He recruited from various discontented and dispossessed social groups and created a coalition of rebellious people from Arab and Khurasan. As Abu Muslim was the leading factor in the defeat of Umayyads and rise of Abbasids, so when Abu Abbas as Saffah became the first Abbasid caliph, Abu Muslim was given the governorship of Khurasan in reward for his great services.Then his fame was being increased day by day. Al Mansur the second Abbasids Caliph was in fear of Abu Muslim for his increasing popularity and growing influence on Abbasid Caliphate. So he ordered to murder of Abu Muslim and he was killed in the court of Al Mansur. But this great hero still after more than a thousand and two hundred years remains in the heart of the people.