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Welcome to the History Extra podcast, fascinating historical conversations from the makers of BBC History Magazine. Genghis Khan may have built a formidable land empire, but his grandson, Kubla Khan, mastered the seas.

So how did a nomadic leader come to have such a formidable navy and conquered China in the process?

Well, Emily Griffith spoke to Jack Weatherford about his new book on the subject

to find out more. So we are going to be talking all about Kubla Khan, the Emperor of the Seas,

as you've just written a book, which is called exactly that. So would you mind introducing us

to Kuplakan? Could you give us that 60-second introduction to him?

Yes, Kubla Khan is the grandson of Jenghis Khan, who is, of course, the greatest conquer

in the history of the world. And he became not only the great Khan of the Mongolian Empire,

but also the emperor of China, and that's what he's best known for today.

Probably in all of Chinese history, he's the best known of all the emperors.

But what people don't know is the part about the sea.

...