Tian, also known as usurping Qi. It refers to the event that the descendants of Chen Guotian replaced the surname of Jiang Lu of Qi State to become the Duke of Qi (formerly known as the King of Qi). This incident was recorded in Family and Tian Family. In 386 BC, King An of Zhou officially sealed Tian He as the marquis of Qi, and from then on Tian gained the legal status of the marquis of Qi in form.
In 379 BC, Qi Kanggong died and Feng Yi entered Tian's family. Since then, Jiang surnamed Lu has withdrawn from the historical stage of Qi. As a result, Tian Daiqi, like the division of Jin, became an important historical turning point in the Spring and Autumn Period and the Warring States Period. As we all know, the division of the three clans into the State of Jin occurred because of the weak public power of the State of Jin.
According to historical records such as Historical Records, Strategies for the Spring and Autumn Period and the Warring States Period, as early as 67 BC1year, civil strife occurred in the state of Chen. In this context, Chen Gongzi fled to Qi to avoid disaster, and later became the ancestor of Qi Guotian ("Chen" and "Tian" were originally a word).
Therefore, the field that replaced Jiang's family in Qi was actually the descendant of Chen in the Spring and Autumn Period. After Chen Wan came to Qi, he was appointed as prime minister by Qi Huangong, then the monarch of Qi. Since then, Chen, or Tian, has taken root and sprouted in Qi. In 545 BC, Tianwan IV Sun Tianyu, together with Bao, Luan and Gao, wiped out the Qing family in that country and won the support of the nobles and people of Qi.