William Tell is a folk story hero from Switzerland. According to legend, Tell was an expert marksman with a crossbow and was the man who killed Albrecht Gessler, a tyrant ruling in Altdorf. Many have debated whether he was a real person or not, but modern historians do not believe there is evidence that he was real.
While the influential book The Art of War has been attributed to Sun Tzu, a legendary Chinese general, military strategist, philosopher, and writer, it is not 100% clear whether he existed or not. His historicity is still uncertain, and many have said that the book may actually be a compilation of many military leaders’ lessons.