Main advisor is Guag Zhong, who wrote early philosophical treatise, Guanzi. Invented more impersonal state institutions. State monopoly of iron and salt. Taxation of territories to support central army.
Some Chinese states start minting coins.
5th century gold starts being used as money. 641 State of Song defeats state of Zeng and puts Zeng ruler to death as sacrifice to ancestors. Duke Wen inflicts massive defeat of Chu at battle of Chengpu, named second hegemon of Zhou. 514 Beginning of rule of King Helu of Wu who employed Sun Tzu. 510 Approximate date Sun Tzu hired by Wu.