This paper examines the connection between the preponderance of the Ming eunuchs under Emperor Yongle and Emperor Xuande and the dispatch of the“treasure ships”in seven epochal maritime expeditions to the Western oceans under the command of admiral Zheng He and his associate Wang Jinghong during the early fifteenth century. Despite a profusion of scholarly literature, Chinese and Western, on diverse aspects of these spectacular voyages, almost none investigate the role played by the eunuchs of the inner court familiar with seafaring. This oversight was evidently due to the fact that since Zheng He and his associates were mostly eunuchs, it was assumed that their activities had already bespoken the eunuch contributions. Moreover, there are few sources that expose the working of the eunuchs in the initiation and management of the expeditions. In several interrelated issues, the author seeks to demonstrate how the court eunuchs, having won their master’s confidence and acquired unchecked power, planned and managed the expeditions to fulfil the ambition and desire of the emperor without the knowledge of outsiders. The secrecy of their missions, that they masterminded the operation in the emperor’s name and communicated the outcomes only to the emperor and not to the governmental bureaucracies, accounted for many gaps of information on the vicissitudes of the voyages, including the dates of departure and return, the objectives and results of the voyages in the official records. Seen in this light, the contention reported in late Ming works such as Yang Zongjian's Shuyue zhouzhilu or Gu Qiyuan's Kezuo zuiyu that the dearth of official records on these missions was caused by destruction of the archives by later scholar-officials who had decried the extravagant costs of the maritime expeditions and their futility to the national cause could not be valid. The deliberate lowkey reporting of these episodes in the Taizong shilu, the reign records of the Yongle emperor, by official compilers under Xuanzong who sought to deflect criticisms that these treasure seeking maritime adventures and bellicose attitude toward the foreign states to enforce the tributary system violated the ancestral injunctions laid down by the dynastic founder Taizu further obscured their real intentions. The last part of the essay re-evaluates the historical and recently available archaeological evidence for a reconstruction of the life and career of both Zheng He and Wang Jinghong, in particular on how they became eunuch and rose to pre-eminence by serving in the military guards of the future Yongle emperor and campaigning on his behalf in the usurpation of the throne. In the case of Zheng He, attention is focused on his Muslim nobility ancestry in Yunnan since the Mongol era, the origin of his surname Zheng, dates of birth and death, whether or not his remains were brought home for burial after his death in Calicut, and the controversies over the sites of his grave in different locales in Nanjing. In the case of Wang Jingzhong, it introduces solid evidence that his original name was Wang Kuitong, the name“Jingzhong”was invested by Emperor Renzong and was used in the Taizu shilu and subsequent official records; it also examines his seafaring background in Fujian and his career as chief eunuch and commander of the maritime voyages together with Zheng He. It is argued that he was not subordinate to Zheng He but was in fact a co-commander of the armada by contributing his knowledge and experience in navigation. It is significant that he was given a higher profile than Zheng He in the seventeenth-century novel of the maritime voyages Sanbao taijian Xiyangji tongsu yanyi by Luo Maodeng who wrote this work to showcase the might of Chinese sea power in the waning days of the Ming dynasty.