What is the theme in Antigone by Sophocles?

Challenge to authority is the main theme in Antigone. For Antigone, the issue is very personal, in that her positions are defined by the particular question of what is to happen to the body of her brother, “authority” having decreed that the body is to be left unburied. Antigone is willing to suffer the consequences for standing up to her uncle and doing, what she feels, is her duty to her dead brother.