Today is the anniversary of the Battle of the Zab, which took place in 750 and was the climactic battle in the Abbasid Revolution that ousted the Umayyad dynasty from the caliphate. Obviously it would be difficult to describe the battle without going over the causes of the revolution, but equally obviously we could be here for many thousands of words discussing an event as large in scale and impact as the Abbasid Revolution. So I’ll try to stick to some basic bullet points. The extremely short explanation is this: a whole bunch of people in the caliphate had become very, very fed up with living under Umayyad rule.
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