Plato studied under Socrates and was Aristotle's teacher. Together these three Greeks developed the basis of philosophical thinking for the entire Western world. Plato was also a writer, mathematician, and founder of the Academy in Athens, which was the first university in Europe. Meno is one of the earliest dialogues in which Plato seeks to define virtue. Socrates is asked can virtue be taught. His response is that he as yet cannot define virtue. Plato tries to answer the question what makes good people good. Plato brings up this question later in his work Protagoras.