Semele is ’ mortal mother, the daughter of , and the sister of , , and . Semele was killed accidentally by her lover, the supreme god , when he took on the form of a lightning storm. Though she never appears on the stage, she is a major reason for Dionysus’ presence in Thebes. Since her death, rumors spread that her lover was a mortal, and that she had invented the Zeus to protect her dignity. Dionysus has come to prove his godliness and thereby restore honor to his mother’s name.