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In page Marco Polo:

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They continued overland until they arrived at Kublai Khan's palace in Shangdu, China (then known as Cathay). By this time, Marco was 21 years old.[citation needed] Impressed by Marco's intelligence and humility, Kublai appointed him to serve as his foreign emissary to India and Burma. He was sent on many diplomatic missions throughout his empire and in Southeast Asia, (such as in present-day Indonesia, Sri Lanka and Vietnam),[12][13] but also entertained the Khan with stories and observations about the lands he saw. As part of this appointment, Marco travelled extensively inside China, living in the emperor's lands for 17 years.[14]