 In 435, Feng Hong the emperor of Northern Yan, under constant Northern Wei attack, offered to be a vassal to Liu Song to try to obtain assistance, and Emperor Wen created Feng Hong the Prince of Yan.However, Emperor Wen was unable to provide actual assistance, and Feng Hong evacuated his state and fled to Goguryeo in 436.Around that time, a severe political infighting began to develop within Emperor Wen's administration.