AD 620 years , Takenori July 2003 , the founding of the Tang Dynasty emperor Li Yuan the second son - Qin Li Shimin, the Father of life conquests Luoyang. Luoyang is a former Sui East , political , military, and economic aspects have an important significance . Luoyang, the war became the most important battle of the Tang Dynasty unified the Central Plains .

Li Shimin, beat the the Datang two most powerful enemy, the credit is spread all over the world . Li Yuan him as day policy will be recognition of Li Shimin 's merit , and give all sorts of privileges , the position is almost comparable with the Prince .

Li Shimin forces caused by the rapid expansion of Li Yuanji jealousy , but also to the Prince Li Jiancheng deeply disturbed . Li Yuanji greedy for power and status more and more , he is on the surface reckless , but in fact has designed a huge conspiracy . He decided that the first joint Prince Edward entire inverted brother Li Shimin , and then usurped the throne from Prince's hands . Li Yuanji use of Li Jiancheng Li Shimin 's suspicion, took the opportunity at the instigation .