The dramatic structure used by Sophocles in Oedipus Rex is essentially the same five-part structure found in tragic plays written by other ancient Greek playwrights, including Aeschylus and Euripides.
Prologos. The play opens with a prologos (prologue) which is the first entrance of one or more actors in the play. These actors provide "exposition" (background information) on the play for the audience (although the audience is very familiar with the myths and legends on which the play is based), and they set the play in motion.
In Oedipus Rex, a Priest appeals to Oedipus, King of Thebes, on behalf of the Theban people who are suffering from a drought and plague. Creon returns from the Oracle at Delphi to report that Apollo commands that in order for the drought and plague to be lifted, Thebans must find and banish from Thebes the murderer of their former King, Laius. Oedipus vows to do so.
Parodos. Following the prologos, the Chorus enters, dancing and singing the parados—a choral ode. The Chorus in
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