Within the Athenian democratic environment, many philosophers from all over the Greek world gathered to develop their theories. Socrates (470-399 BCE) was the first to raise the question, further expanded by his pupil Plato (died 348/347), about the relation/position of an individual within a community. Aristotle (384–322 BCE) continued the work of his teacher, Plato, and laid the foundations of political philosophy. The political philosophy developed in Athens was, in the words of Peter Hall, ""in a form so complete that hardly added anyone of moment to it for over a millennium"". Aristotle systematically analyzed the different systems of rule that the numerous Greek city-states had and divided them into three categories based on how many ruled: the many (democracy/polity), the few (oligarchy/aristocracy), a single person (tyranny, or today: autocracy/monarchy). For Aristotle, the underlying principles of democracy are reflected in his work "Politics":