Guan Zhong and Xiang Heng, the minister of Qi State, greatly strengthened their political and military power and dominated the Central Plains in the middle of the seventh century BC, which enabled Huan Gong to carry out comprehensive political and economic reforms in Qi State and helped him become the first of the five tyrants in the Spring and Autumn Period.

Guan Zhong (723 BC-about 645 BC), Han nationality, whose name was Yiwu, was also known as a famous politician and strategist of Qi in the Spring and Autumn Period, and was born in Yingshang (now Yingshang, Anhui). History is called a pipe. Guan Zhong lost his father when he was young, and his mother was in the hospital, living in poverty. In order to make a living, he joined the army after doing business in partnership with Bao, and after many twists and turns, he was recommended by Bao as the minister of Qi, known in history as "the first phase of the Spring and Autumn Period". He has been in power for 40 years, and selected scholars by officials at all levels and rewarded them as appropriate. The diplomatic strategy of "respecting the king and rejecting foreign countries" made Qi Huangong the first overlord in the Spring and Autumn Period.