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| | Abbasids |
 | | The quarrel was taken up by his brother Abdallah, known by the name of Abu al-'Abbas as-Saffah, who after a decisive victory on the Greater Zab river (750) finally crushed the Umayyads and was proclaimed caliph. |
 | | The history of the new dynasty is marked by perpetual strife and the development of luxury and the liberal arts, in place of what their opponents identified as old-fashioned austerity of thought and manners. |
 | | In the reign of Marwan II this opposition culminated in the rebellion of Ibrahim the Imam, the fourth in descent from Abbas, who, supported by the province of Khorasan, achieved considerable successes, but was captured (AD 747) and died in prison (as some hold, assassinated). |
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