In order to make the State of Zhao submissive, King Zhaoxiang of Qin invaded the state of Zhao one after another.
At the beginning of emperor Taizong of tang’s reign（personal name Li Shimin）, the northwest frontier of Tang Dynasty was very unstable.
After Fulin (known as emperor Shunzhi or Shizu of Qing Dynasty in History) died, his son Xuanye ascended the throne (known as Emperor Kangxi or emperor Shengzu of Qing Dynasty in History).
In the first month of 1368, Zhu Yuanzhang founded the Ming Dynasty in Yingtian (now Nanjing). (known as Emperor Taizu of Ming Dynasty in History)
After the joint destruction of the Jurchen Jin Dynasty by Empire Of Mongolia and the Southern Song Dynasty, the Southern Song Dynasty took the opportunity to send troops to recover the land in Henan.
After the fall of the Northern Song Dynasty, Zhao Gou, the king of Kang who had stayed in Xiangzhou, fled to Shangqiu.
As the founding emperor of the Northern Song Dynasty, Zhao Kuangyin was originally a general of the Later Zhou Dynasty and made many contributions to it.
After Li Yuan became emperor (known as emperor Gaozu of Tang Dynasty in History), he made Li Jiancheng crown prince, Li Shimin as king of Qin, and Li Yuanji as king of Qi.