In 1206, the Mongols, vassals to the Jurchens, rose in Mongolia. Their leader, Genghis Khan, led Mongol troops against the Jurchens, who were finally defeated by Ögedei Khan in 1234. The Jurchen Jin emperor Wanyan Yongji's daughter, Jurchen Princess Qiguo was married to Mongol leader Genghis Khan in exchange for relieving the Mongol siege upon Zhongdu (Beijing) in the Mongol conquest of the Jin dynasty. Under the Mongols' control, the Jurchens were divided into two groups and treated differently: the ones who were born and raised in North China and fluent in Chinese were considered to be Chinese (Han), but the people who were born and raised in the Jurchen homeland (Manchuria) without Chinese-speaking abilities were treated as Mongols politically. From that time, the Jurchens of North China increasingly merged with the Han Chinese while those living in their homeland started to be Mongolized. They adopted Mongolian customs, names and the Mongolian language. As time went on, fewer and fewer Jurchens could recognize their own script.