chunk: Amphitryon begins with a prologue given by the god Mercury, in which he gives some background information to the audience. Amphitryon and his slave Sosia have been away at war and are returning to Thebes. Meanwhile, the god Jupiter is sleeping with Amphitryonâs wife Alcmena. Jupiter is in the guise of Amphitryon so that Alcmena is unaware that he is not her husband.
  Mercury's job is to buy his father Jupiter some time by deceiving those who would interfere. He changes his appearance to look like the slave Sosia, and when the real Sosia arrives, he beats him up and sends him away from the house. Thoroughly confused by having been beat up by himself, Sosia returns to the ship to relay what happened to his master Amphitryon.