Who defeated the last song emperor of china? genghis khan kublai khan tang taizong emperor taizu

At the time, China was split into three main dynasties: Jin (gold), Western Xia (summer) and Southern Song (holy wood).  The conquest spanned over 60 years starting in the 1200s. The Xia Dynasty fell in 1227, with Emperor Mozhu killed, for the fear that they would rebel.  In 1234, the Jin Dynasty collapsed and Emperor Aizong fled the palace.  He later committed suicide and passed the throne to his general, who became the last emperor (Modi) and ruled for two hours (the shortest reign in the history of China) before being executed.  The Song Dynasty lasted the longest before collapsing in 1279.  The eight years old Emperor Bing was killed by the Mongols in battle.  Genghis Khan had started the conquest and saw the fall of the Xia Dynasty.  His son and successor Ogedei Khan saw the fall of the Jin Dynasty and, finally HIS nephew, Kublai Khan conquered all of China.

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