Bacchae
... Before Euripides wrote the play The Bacchae in the 5th century, the Athenian audience already had somewhat preconceived ideas of Dionysus. ... The story of Dionysus been born from the thigh of Zeus was well known though in Euripides The Bacchae it was widely disbelieved by the Athenian population. ... This two-faced attribute is seen from the very start of The Bacchae when Dionysus first appears presenting himself disguised as a mortal man, ‘veiling my godhead in a mortal shape.