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Control the sea, and you control everything...a gripping tale of naval warfare, dynastic rivalry, and technical innovation, from the author of the classic work Genghis Khan and the Making of the Modern World.. Genghis Khan built a formidable land empire, but he never crossed the sea. Yet by the time his grandson Kublai Khan had defeated the last vestiges of the Song empire and established the Yuan dynasty in 1279, the Mongols controlled the most powerful navy in the world. How did a nomad come to conquer China and master the sea? Based on ten years of research and a lifetime of immersion in Mongol culture and tradition, Emperor of the Seas brings this little-known story vibrantly to life.. Kublai Khan is one of history's most fascinating characters. He brought Islamic mathematicians to his court, where they invented modern cartography and celestial measurement.