The barbarian nomads of the Eurasian steppes have played a decisive role in world history, but their impact has gone largely unnoticed. These nomadic tribes have produced some of the world’s greatest conquerors: Attila the Hun, Genghis Khan and Tamerlane, among others. And their deeds still resonate today.

These nomads built long-lasting empires, facilitated the first global trade of the Silk Road and disseminated religions, technology, knowledge and goods of every description that enriched and changed the lives of so many across Europe, China and the Middle East. From a single region emerged a great many peoples – the Huns, the Mongols, the Magyars, the Turks, the Xiongnu, the Scythians, the Goths – all of whom went on to profoundly and irrevocably shape the modern world. But their legacy is also death. An estimated 100 million died in the Mongol conquests, include 90 percent of Iran’s population, which only recovered in the 20th century.

To discuss these legacies is Kenneth Harl, author of “Empires of the Steppes.” He draws on a lifetime of scholarship to vividly recreate the lives and world of these often-forgotten peoples from their beginnings to the early modern age.

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