Philolaus (; ; c. 470 – c. 385 BCE) was a Greek Pythagorean and Presocratic philosopher. He argued that at the foundation of everything is the part played by the limiting and limitless, which combine together in a harmony. He is also credited with originating the theory that the Earth was not the center of the universe. According to August Böckh (1819), who cites Nicomachus, Philolaus was the successor of Pythagoras.