King Ji Fei of Jin Mu, the eighth grandson of Tang Shuyu, the ninth monarch of the Jin Kingdom, reigned from 811 BC to 785 BC.
Tang Shuyu passed on the son of Jin Hou Xie, Jin Hou Xie passed on Jin Wu Hou Ji Ning, Jin Wu Hou passed on Jin Cheng Hou Ji Fu, Jin Cheng Hou passed on Jin Li Hou Ji Fu, Jin Li Hou passed on Jin Jing Hou Ji Yijiu, Jin Jing Hou passed on Jin Hou Ji Situ, Jin Xi Hou passed on Jin Xianhou Ji nationality, Jin Xian Hou Ji passed on Jin Mu Hou Ji Fei Wang.
During the reign of Marquis Muhou of Jin, the Western Zhou Dynasty had entered the late stage, and the control of the Rongdi tribe was no longer as stable as it was in the early and middle Western Zhou Dynasty. At that time, because of the coveting of the wealth of the Central Plains, the dog Rong often sent troops to invade the Central Plains and plunder property.
In 805 B.C., Beirong invaded the northern region of the Jin Kingdom, and the Marquis of Jin Mu personally led a large army to the rescue but was defeated by Beirong.
After Jin Muhou returned to the capital, he couldn't let go of this defeat for a long time, and always wanted to find an opportunity to take revenge. Just when the Marquis of Jin Mu was fighting and preparing to take the initiative to attack Beirong Yixue, his wife Qi Jiang gave birth to his first son. In order to warn himself not to forget the revenge of the invasion of Beirong, Jin Muhou insisted on naming his eldest son "Qiu" with a bad meaning despite the persuasion of Qi Jiang and the ministers.
In 802 BC, after three years of full preparation, the Marquis of Jin Muhou finally launched an attack on Beirong.
In this battle, because the Jin army was well prepared, and Beirong never thought that the Jin army would take the initiative to attack, so he was unprepared, and the result also led to a great defeat by the Jin army. Not long after Jin Muhou returned to the dynasty in victory, Qi Jiang gave birth to a son for him, and Jin Muhou named his second son "Chengshi" in order to celebrate his victory over Beirong.
In 785 B.C., Jin Muhou died, and his younger brother Ji seized the throne of the Jin State by force, known as the Jin Uncle in history, which was also the first time that the primogeniture inheritance system was destroyed since the Jin State.