Sun Wu (bettter known as Sun Tzu) was an ancient Chinese military general, strategist and philosopher who is traditionally believed, and who is most likely, to have authored the Art of War, an influential ancient Chinese book on military strategy. Sun Tzu has had a significant impact on Chinese and Asian history and culture, both as an author of the Art of War and through legend. During the 19th and 20th centuries, Sun Tzu's Art of War grew in popularity and saw practical use in Western society, and his work has continued to influence both Asian and Western culture and politics. Historians have questioned whether or not Sun Tzu was an authentic historical figure. Traditional accounts place him in the Spring and Autumn Period of China (722–481 BC) as a military general serving under King Helü of Wu, who lived c. 544—496 BC. Modern scholars accepting his historicity place the completion of The Art of War in the Warring States Period (476–221 BC), based on the descriptions of warfare in the text, and on the similarity of text's prose to other works completed in the early Warring States period."