A philosopher of ancient Athens, Socrates (469–399 BCE) believed strongly in living by one's philosophy, and that the pursuit of one's own beliefs is necessary for all intelligent men. He was a teacher to Plato, who describes the teachings of Socrates in his dialogues, as well as the events of his teacher's life. Socrates' beliefs led him to critisize some of the ways of the Athenians in his teachings. In 399 BCE, he was accused and tried of the corruption of youth and for religious heresies, which led to his death.