When did Aristotle live?

Aristotle's ethics builds upon earlier Greek ethics, particularly that of Aristotle's teacher Plato and his teacher, Socrates. One important distinction is that Socrates didn't leave any written work, Plato left works aimed more toward popular consumption, and Aristotle left more scholarly works. More frequently than Plato, Aristotle notes exceptions to his general rules and the lack of precision in his ethics. The overall directions of each of these philosophers, however, were quite similar.