Protagonist Defined.

      The word alone came from an historic country like Greece. Protagonist originated from Athens and it is one person who plays the main part; the chief actor which can be a man or women.
     It's the primary figure that will be the central of a play, theatrical , cinematic or musical production.  It is the personage the audience most remembers and identifies with .
     The most noted example that I identify with is Joan of Arc who was a Protagonist in plays and film feature "The Messenger".    In ancient Greece theatre a "Deuteragonist" and a "Tritagonist" played others roles alongside the protagonist as there were always 3 played all tragic dramas.