Alexander the Great

I believe Alexander definitely deserved his title. To be called the Great worldwide, one must accomplish something that affected many different people and he definitely fulfilled this requirement. He conquered an astonishing amount of territory. Although all of it wasn't positive, such as how many people he killed, one can not deny that he accomplished something that very few individuals have throughout history. Added to that, he accomplished all of this at a very young age before dying at the age of 30.