—Lu Yu, eighth-century tea master CHINA ISOLATES HERSELF Although historical events in China during the fifteenth, sixteenth, and seventeenth centuries had little direct impact on the story of tea, they form a chapter that cannot be ignored, for these events formed the foundation for the tremendous impact tea was to have on the world—and particularly on China—during the eighteenth and nineteenth centuries. The Ming dynasty lasted 276 years, under the rule of sixteen different emperors. It was a time in Chinese history during which arts and culture were emphasized, and there was great enthusiasm for maritime exploration. During the early fifteenth century, China amassed the most powerful naval force ever assembled in the world, and one that was larger than any other until modern times. Under the leadership of an Admiral Zheng, Chinese ships went to present-day Vietnam, Java, Sumatra, Sri Lanka, and the east coast of Africa. Tea proved to be a popular trade item wherever these ships traveled.