The Abbasid Revolution (part 2): The Umayyad Blind Spot

By the 740s the Umayyad dynasty ruled the largest empire on earth from Damascus, stretching from Spain to the edge of Central Asia. From the outside it looked unbeatable. Underneath, it was tearing itself apart. A reigning khalifa had been murdered by his own kin, the ruling family had fallen into civil war over the throne, and the Arab tribes that manned its armies had split into the old feuding blocs of Qays and Yaman. Into that crisis stepped Marwan the Second, a hardened frontier soldier and the last Umayyad khalifa, a man who never got a single quiet year on the throne.

This episode is the story of the Umayyad blind spot, and of the man who saw through it. Two thousand miles to the east, in Khurasan, the aged governor Nasr ibn Sayyar watched the black-banner revolution take shape and wrote west again and again, warning in plain words and in verse that there were embers glowing beneath the ash. Damascus, at war with itself, never read him. He died on the road with every one of his warnings proven right and not one of them acted on. From there the story moves to the collision itself: the audacious proclamation of Abu al-Abbas, the caliph who took the name al-Saffah, the shedder of blood, months before the war was even won, and then the Battle of the Great Zab on the twenty fifth of January, 750, where a smaller Abbasid army under Abd Allah ibn Ali brought down the largest army in the world with a wall of kneeling spearmen and a bridge of boats that a panicking khalifa cut with his own men still on the wrong side of the river.

What makes this a tragedy rather than a simple victory is the thing it reveals about how powerful states actually die. The Umayyad empire did not fall because it was weak. The army was huge and the treasury was full. It fell because of contempt, for the non-Arab converts it taxed and ignored, for the distant provinces it milked, and for the loyal old man in the east whose letters were never interesting enough to open. And it is the story of what came after the battle, a reckoning that was the opposite of mercy, and the single Umayyad prince who slipped the net and carried his family's name across the sea to Spain.

Sources include al-Tabari's Tarikh al-Rusul wa'l-Muluk (The History of the Prophets and Kings), Ibn Kathir's al-Bidaya wa'l-Nihaya, and modern work including Firas Alkhateeb's Lost Islamic History, with the honorific "peace be upon him" observed for the Prophet Muhammad (peace be upon him) throughout.

Content Warning: This episode describes battlefield killing, mass drowning, and the massacre and desecration of the defeated Umayyad family, told with restraint but not avoided.

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