• Promises made by the Abbasids to restore the Tawhidic civilization as formulated by the founder of Islam Muhammad
• The extreme desire to end all oppressions of the dissident groups like those inflicted by the Umayyads
Such an image of different Arabs as portrayed by the Abbasids helped them to win huge support of the masses. To make such promises a reality, a revolution under the Abbasid leader Abu Muslim was raised in 747 AD. The revolution reached its climax in the war of Zab (750 AD), which gave the final blow to the Umayyad hegemony. This revolution sealed the fate of the Umayyads in the Arab region and paved the way for the dissemination of Iranian culture.