Socrates, Plato, and Aristotle formed a great triumvirate of classical Greek philosophers. Socrates used questioning to teach virtue, Plato was his student and wrote dialogues featuring Socrates, and Aristotle was Plato's student who went on to tutor Alexander the Great and founded his own school. Together, they laid the fundamentals of Western philosophy through Socrates' teachings, Plato's dialogues and ideas of forms, and Aristotle's writings on logic, happiness, and moderation.