Sun Tzu is a honorific title bestowed upon Sūn Wu (c. 544-496 BC), the author of The Art of War, an immensely influential ancient Chinese book on military strategy.

He is also one of the earliest realists in international relations theory. In the author's name, Sūn Wu, the character wu, meaning "military", is the same as the character in wu shu, or martial art. Sun Wu also has a courtesy name, Chang Qing (Cháng Qīng).

Confucius (551-479 BCE) was born into a noble family in the Chinese state of Lu. His father died when he was very young and the family fell into poverty. Confucius resigned from a political career and then travelled for many years, searching for a province willing to adopt his ideas. Unsuccessful, he returned to Lu where he spent the rest of his life teaching. He is considered one of the most influential figures in the world.