Socrates, an Athenian contemporary of Pericles (c. 470 – 399 B.C.), is a central figure in Greek philosophy. Socrates is known for the Socratic method (elenchus), Socratic irony, and the pursuit of knowledge. Socrates is famous for saying that he knows nothing and that the unexamined life is not worth living. He is also well known for stirring up sufficient controversy to be sentenced to a death that he had to carry out by drinking a cup of hemlock. Socrates had important students, including the philosopher Plato.