Marco Polo was a merchant traveller who is most famous for his journeys, are recorded in Il Milione.
According to the Junior Woodchuck Guidebook, Marco Polo saw the Lost Crown of Genghis Khan during his search for the real land of Prestor John in China. He claimed to have found Prestor John’s Land and told Kublai Khan of it when he reached Cathay. Kublai invaded Tibet and moved into the kingdom.