The Mongol queens of the thirteenth century ruled the largest empire the world has ever known. Yet sometime near the end of the century, censors cut a section from The Secret History of the Mongols, leaving a single tantalizing quote from Genghis Khan: "Let us reward our female offspring." Only this hint of a father's legacy for his daughters remained of a much larger story.? The queens of the Silk Route turned their father's conquests into the world's...