With the assistance of a powerful political group with Guan Zhong as the backbone, Duke Huan of Qi carried out reforms, developed the economy, put the military in government, deployed troops in agriculture, and enriched the country and strengthened the army. Under the call of "respecting the king and rejecting the barbarians", the nine princes united to unite the world, and finally created the great cause of being the first hegemon in the Spring and Autumn Period.
