Marriage as Political Strategy and Cultural Expression is the first comprehensive study of Mongolian royal marriages from World Empire (1206-1279) to the Yuan dynasty (1279-1368) in Asia. This study examines the Mongolian royal family's marriage strategies and the political implications of these royal marriages, specifically, the intermarriages between the Mongolian royal house and its allies, including the Onggirat, the Oirat, and other Mongol peoples as well as the Uighur State and Korea in Central and East Asia. This book concludes that the short lifespans of Mongol royalty after Khubilai Khan were the result of consanguineous marriage and inbreeding - genetic factors that contributed to the collapse of the Mongol dynasty.