Kammala wannan jumla: Zhongdu ya kasance babban birnin Jin na sama da shekaru 60, har zuwa lokacin da
mamayewa na Mongols a cikin 1214. Mongols, mutanen ƙabila masu ƙaura daga Mongolian Plateau da kudancin Siberia, sun taimaka wa Jurchen a yaƙin da Khitan, amma ba a ba su diyya da aka yi alkawarinta ba. A shekara ta 1211, 'yan Mongol da Genghis Khan ya jagoranta sun ɗauki fansa kan Jin ta hanyar mamaye arewacin China. A shekara ta 1213, ya mallaki yawancin yankin Jin a arewacin Kogin Yellow ban da babban birnin Zhongdu. A watan Maris na shekara ta 1214, ya kafa hedkwatar a arewacin Zhongdu kuma tare da ɗan'uwansa Hasar da manyan 'ya'yansa maza uku, Jochi, Chagatai da Ögedei, suka fara kewaye birnin. Kodayake an raunana kotun Jin ta hanyar juyin mulkin fadar, an kare birnin da matakai uku na moats da hasumiya 900. Lokacin da cutar ta barke a cikin Mongol, Genghis Khan ya aika da jakadan musulmi Ja'far zuwa cikin birni don tattaunawa, kuma kotun Jin ta amince da yarjejeniyar zaman lafiya ta hanyar ba da ƙasa da karɓar matsayin mai mulki. A cikin abubuwan da Genghis Khan ya bukaci shi ne ya auri wata 'yar sarki Jurchen. Gimbiya Qicheng, 'yar Wanyan Yongji, an sanya ta a matsayin shugaban Mongol. An tura ta tare da masu gadi 100, da bayi mata da maza guda 500, da kuma tufafi guda 3,000 da dawakai guda 3,000 zuwa sansanin Mongol. Gimbiya Qicheng ta zama ɗaya daga cikin manyan matan Genghis Khan guda huɗu, waɗanda suka ɗage kewaye kuma suka janye arewacin Juyong Pass.