(born circa 1371, Kunyang, Yunnan province, China—died April 1433, Calicut, India) Eunuch admiral and diplomat who helped extend Chinese maritime and commercial influence throughout the region bordering on the Indian Ocean.The Yongle emperor named Zheng commander in chief of missions to the “Western Oceans.” He first set sail in 1405 and on this mission visited Champa (southern Vietnam), Siam (Thailand), Malacca, and Java, traveled through the Indian Ocean as far as Sri Lanka, and returned to China in 1407. Subsequent voyages took him to Arabia, the eastern coast of Africa, Southeast Asia, and India. Chinese emigration to, and influence in, Southeast Asia increased in the wake of these missions, resulting in tributary trade to China that lasted into the 19th century.

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