 His successor, Ögedei Khan, invaded the Jin dynasty again in 1232 with assistance from the Southern Song dynasty.The Jurchens tried to resist; but when the Mongols besieged Kaifeng in 1233, Emperor Aizong fled south to the city of Caizhou.A Song–Mongol allied army looted the capital, and the next year Emperor Aizong committed suicide to avoid being captured when the Mongols besieged Caizhou, ending the Jin dynasty in 1234.