He didn't represent any country. He and his father were merchant adventurers from Venice, Italy and they did the trip on their own.
China sponsored Marco Polo's exploration.
Italian Trader
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Italy
Marco Polo had never been to Japan, but he did write about what he heard about the country while he was in China. Marco Polo called Japan Cipangu, which means 'the country of Japan' in Chinese.
Italy
Marco did not sail for a country
Spain :)
china
Italy
vinice