Although accounts differ over the Sun Tzu's origins, according to a biography written by a 2nd century BC historian he was a general who lived in the state of Wu in 6th century BC.
Sun Tzu is most famous for the Art of War, praised as the definitive work on military strategy and tactics prior to the collapse of imperial China. Consisting of 13 chapters, the Art of War is one of the most famous studies on strategies for military success.
The most fundamental of Sun Tzu's principles is that "warfare is based on deception", and he believed that "the supreme art of war is to subdue the enemy without fighting". One of his stratagems emphasizes the importance of knowing your enemy, "If you know the enemy and know yourself, you need not fear the result of a hundred battles.
If you know yourself but not the enemy, for every victory gained you will also suffer a defeat". Today his work has found new applications in areas totally unrelated to its original military purpose and used as a guide in business, sport, diplomacy, and even in dating!