Abu Muslim's army attacks the Umayyads and…
748 CE to 759 CE
Abu Muslim's army attacks the Umayyads and occupies Iraq in 747.
Abd al Abbas (not a Shia) is established in Baghdad as the first caliph of the Abbasid Dynasty in 750.
The Abbasids, whose line is called "the blessed dynasty" by it supporters, present themselves to the people as divine-right rulers who will initiate a new era of justice and prosperity.
Their political policies are, however, remarkably similar to those of the Umayyads.