Poll: Who's the greatest Philosopher of all time?

Even though many would pick one of the "holy triangle" Socrates-Plato-Aristotle, i would say Empedocles was the greatest philosopher who ever lived and he spoke about things of nature and science that people discovered in early and mids of the 20th century. For some reason history decided to hide this man from the wide mass........... i guess they had their own reasons!