Socrates is the main character in The Republic. Plato uses his teacher to
advocate his own ideas about how society should be governed. Socrates was one of
the most influential Greek philosophers, and is credited with inventing the
Socratic dialogue. Perhaps his greatest accomplishment was the education of
Plato, who eventually surpassed his instructor in intellect.
Cephalus and Polemarchus:
This father and son combination offer their home to Socrates toward the
beginning of The Republic. Though they express their own ideas about
justice, they are of little importance to the theme of Plato's work.
Glaucon and Adeimantus:
These are other men involved in the early discussion in Cephalus' house. They,
likewise, offer certain viewpoints, which Socrates uses to expand his own vision
of human society.
This man also helps Socrates define justice in the opening scene when he asserts
that it is better to live unjustly.