The document summarizes the origins and evolution of theatre in ancient Greece. It discusses how theatre began as religious rituals to worship Dionysus, involving dancing and emotional displays. Over time, these rituals evolved to incorporate actors and plays, with Thespis first adding a single actor. The three major playwrights of ancient Athens were Aeschylus, Sophocles, and Euripides. The document then focuses on Sophocles, describing his life, works including Oedipus Rex, and innovations to theatre like increasing the number of actors.