What are the three views about justice written by Plato?

"The Republic" is one of Plato's most popular works. In it, he uses the character of Socrates to explore the role that justice plays in a society and the lives of individuals living within it. In the first two books, Socrates is given three different views on justice, which he disagrees with and tries to refute. This leads into a lengthy dialogue about the state, the individuals within it, education and the nature of all things.