"Genghis Khan sired four self-indulgent sons who proved good at drinking, mediocre in fighting, and poor at everything else; yet their names live on despite the damage they did to their father’s empire. Although Genghis Khan recognized the superior leadership abilities of his daughters and left them strategically important parts of his empire, today we cannot even be certain how many daughters he had. In their lifetime they could not be ignored, but when they left the scene, history closed the door behind them and let the dust of centuries cover their tracks. Those Mongol queens were too unusual, too difficult to understand or explain. It seemed more convenient just to erase them. "

Part of the introduction to The Secret History of the Mongol Queens: How the Daughters of Genghis Khan Rescued his Empire by Jack Weatherford.