
Emperor of the Seas: Kublai Khan and the Making of China by Jack Weatherford
By the end of the 13th century, the Mongols ruled the largest empire in history, stretching from China to eastern Europe. The man largely responsible was Genghis Khan but it was his grandson, Kublai Khan, who matched these land gains by ones at sea. He turned a polity that originated in nomadic tribes from landlocked central Asia into an unparalleled maritime superpower.