Documentary looking at the Secret History of the Mongols, said to have been written by Genghis Khan's adopted son, which reveals a very different man to the brutal butcher of Western legend. Not just a womaniser, but a devoted husband. Not just a warrior, but a politician. Not just a conqueror, but a legislator. A man who wanted the lessons he had learnt - good and bad - to be passed onto his successors. Within its pages lies the inside story of how an illiterate nomad inspired his successors to conquer the largest land empire the world has ever seen.