Which dynasty did Guiguzi belong to?

Guiguzi was a man in the Spring and Autumn Period and the Warring States Period.

Guiguzi, Wang,, alias Zen, a legend in the Warring States Period. Famous strategist, originator of military strategists, master of art of war, founder of a hundred schools of thought contend. Because he lives in seclusion in the ghost valley of Yunmeng Mountain, he calls himself Mr. Ghost Valley. His main works are Yin Fu in Guiguzi and Four Wonders.