This is the first episode of a five part series on the Mongol invasions of the Muslim world, and the astonishing reversal that followed. It opens with a survivor of the sack of Bukhara, who summed up the fate of his city in nine words, and then pulls back to show the world as it stood before the catastrophe: Baghdad, capital of the Abbasid khilafa for nearly five hundred years, a metropolis of close to a million people, home to the learning of the House of Wisdom, the center of a connected civilization that stretched from Muslim Spain to the frontiers of India. A world that felt permanent.

Then it turns to the cold grasslands of Mongolia, and to Temujin, the boy who survived a brutal childhood to unite the warring tribes of the steppe and become Genghis Khan. We look closely at the war machine he built, the discipline and the speed and the deliberate use of terror, and at how this did not begin as a holy war at all. It began as a trade dispute. A caravan seized at the frontier city of Otrar, hundreds of merchants killed, an ambassador mutilated and sent back, and a point past which there was no return. In 1219 the storm broke over Central Asia, and the great cities of the eastern Muslim world, Bukhara and Samarkand and the ancient centers of Khurasan, began to fall.

The episode handles the violence the way the Muslim chroniclers did, soberly and without sensationalism, and it is honest about what the sources can and cannot prove, from the famous speech attributed to Genghis Khan in the mosque of Bukhara to the disputed casualty figures. It closes with the historian Ibn al-Athir, who lived through these years and could barely bring himself to write them down, and with the storm turning, at last, toward Baghdad.

Sources: Ibn al-Athir's al-Kamil fi al-Tarikh, Ata-Malik Juvayni's Tarikh-i Jahangushay (History of the World Conqueror), Ibn Kathir's al-Bidaya wa al-Nihaya, and Rashid al-Din's Jami al-Tawarikh, with modern scholarship from Michal Biran, Timothy May, Lost Islamic History, and the Yaqeen Institute.

Content Warning: This episode discusses the mass killing and destruction of the Mongol conquests of Bukhara, Samarkand, and the cities of Khurasan, handled factually and without graphic detail.

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