“The art of war is of vital importance to the state. It is a matter of life and death, a road either to safety or to ruin. Hence it is a subject of inquiry which can on no account be neglected.” So begins The Art of War, a meditation on the rules of war that was first published in China. Historians don’t know the exact date of the book’s publication (though they believe it to be in the 4th or 5th century); in fact, they don’t even know who wrote it! Scholars have long believed that The Art of War’s author was a Chinese military leader named Sun Tzu, or Sunzi. Today, however, many people think that there was no Sun Tzu: Instead, they argue, the book is a compilation of generations of Chinese theories and teachings on military strategy. Whether or not Sun Tzu was a real person, it’s clear that “he” was very wise: The Art of War still resonates with readers today.