Genghis Khan and the Mongol empire, William W. Fitzhugh, Morris Rossabi, William Honeychurch, Houston Museum of Natural Science, Dino Don, 2009, ISBN 978-0-295-98957-0, ... A Nestorian Christian captured by Genghis's troops and then turned over in marriage to his son Tolui, she took charge of her sons' educations, ensuring that they not only applied themselves to military training but learned to read ...