In this ground-breaking, posthumous study, the late Lo Jung-pang discusses the geographic, political, and commercial factors that led to the emergence of seapower and a navy under the Ming. While Zheng He and his seven expeditions have received some scholarly attention, few understand the long history of maritime engagement which provided the nautical and technical background for these voyages. The evolution of this maritime engagement and its extension into the Indian Ocean is the focus of Lo’s still-timely and highly significant work. In addition to detailing the rise of the Ming navy and its extraordinary accomplishments, Lo also examines some of the factors that led to the end of China’s first great maritime era: Why did China suddenly seem to turn away from the seas? Were the military defeats in Annam and on the northern borders significant in this? Or were financial pressures key? Empire in the Western Ocean represents the most comprehensive and insightful English-language treatment to date of the evolution and activities of the early Ming navy. Moreover, it encourages further inquiry into contemporary questions of China’s maritime aspirations.