In 1258, the Mongol army, led by Genghis’s grandson Hülegü Khan, arrived at the gates of Baghdad. As per Mongol custom, Hülegü sent an emissary to the Abbasid caliph, al-Mustasim, giving him the option of laying down his arms and surrendering the city. When the caliph refused, Hülegü’s army forced its way through Baghdad’s fortified walls and unleashed a brutal punishment upon its inhabitants. The Mongols burned everything. The books in the Library of Baghdad were flung into the Tigris, turning the waters black with ink. Al-Mustasim’s family was massacred, down to the last child. The caliph
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