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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. No one associates Mongols with the sea. So before Kubla Khan, what did Mongol rulership

look like? Well, it hadn't been for a very long time. It was only two generations. The Mongol

empire had been founded in 1206, and it was basically ruled by

Jenghis Khan and then by his successors by horseback. They were running back and forth all over

the world, conquering the world, all the way from Korea to Hungary. And so they were

...