active 4th century B.C. Guiguzi

Little is known for certain about Guiguzi, traditionally placed in the 4th century B.C. and associated with China’s Warring States period. The name is usually understood as “Master of Ghost Valley,” and both the person and the book carry an air of legend.

The work known as Guiguzi is a collection of ancient Chinese writings on rhetoric, persuasion, and strategy. It is often connected with the so-called School of Diplomacy, and its teachings focus on careful observation, hidden influence, and guiding others through words rather than force.

Because the historical record is unclear, Guiguzi is best understood as a partly legendary teacher whose name became attached to an influential tradition of political and rhetorical thought. Even so, the book’s sharp advice on negotiation and human behavior has kept it alive far beyond its original age.