The Republic is a Socratic dialogue written by Plato sometime around 380 BCE concerning the definition of justice and the order and character of the just city and the just man. It is Plato's best-known work and has proven to be one of the most intellectually and historically influential works of philosophy and political theory. In it, Socrates along with various Athenians and foreigners discuss the meaning of justice and examine whether or not the just man is happier than the unjust man by proposing a city ruled by philosopher-kings. The participants also discuss the theory of forms, the immortality of the soul, and the roles of the philosopher and of poetry in society. Three interpretations of the Republic are presented; they are not exhaustive in their treatments of the work, but are examples of contemporary interpretation. The paradigm of the city - the idea of the Good, the Agathon - has manifold historical embodiments, undertaken by those who have seen the Agathon, and are ordered via the vision. The centre piece of the Republic, Part II, numbers 2-3, discusses the rule of the philosopher, and the vision of the Agathon with the allegory of the cave, which is clarified in the theory of forms. The centre piece is preceded and followed by the discussion of the means that will secure a well-ordered polis (City). Part II, no. 1, concerns marriage, the community of people and goods for the Guardians, and the restraints on warfare among the Hellenes. It describes a partially communistic polis. Part II, no. 4, deals with the philosophical education of the rulers who will preserve the order and character of the city-state.