Siege of Baghdad

The fall of Baghdad ended the Abbasid Caliphate that had stood at the centre of the Islamic world for five centuries, a symbolic decapitation felt far beyond the city. The last caliph was reportedly rolled in a carpet and trampled by horses, so that no royal blood would touch the ground. Baghdad was then the greatest centre of learning on earth, and the sack destroyed its libraries; the story that the Tigris ran black with the ink of drowned books belongs to that memory. The Mongols had breached the eastern wall with engineers drawn from across their empire, and the defence, built on the caliph's standing rather than his troops, collapsed. The disaster is often marked as the close of the Islamic Golden Age.

The black river of ink and the death tolls in the millions are memory-tropes whose literal truth historians doubt, shaped by later chroniclers writing with Mongol or anti-Mongol purposes. There is a parallel debate over how much of Baghdad's long decline should be laid at 1258 at all, rather than at the slow silting of its canals and the drift of trade routes over the preceding centuries. The event survives mainly through partisan accounts on both sides, which is why casualty figures span an order of magnitude and cannot be reconciled. What is not in doubt is the symbolic weight the fall carried then and carries now, as a byword for civilizational catastrophe.