The Umayyad dynasty was brought down by a well-organised movement called ‘Dawa’. It was then replaced by Abbasids in 750. The main center of their uprising was the distant region of Khurasan.
Main Reasons:
- Mobilisation of the mixed Iranian population for various reasons.
- The Umayyad projected themselves rested on force and loyalty of Syrian troops which resented the Arab soldiers.
- The Arab civilians disliked the Umayyad regime for failure to unfulfill their promises.
- Umayyad regime was portrayed as an evil by the Abbasids.
