Why is crown the antagonist in he play antigone?

The answer you are searching for is:

Creon is Antigone's uncle in the play Antigone and is ultimately responsible for her death. Antigone is the daughter of Oedipus, whose sin of accidentally having sex with his mother is arguable responsible for the curse that appears to plague his descendants. Creon is Oedipus's brother, and is currently the king of Thebes; he is committed to maintaining the peace in his kingdom. Just prior to Creon's rule, Antigone's brothers, Eteocles and Polynices, had engaged in a bloody battle for control of Thebes. When both brothers died and Creon assumed power, Creon decreed that only Eteocles would receive a burial; Polynices would be left to rot.

Antigone disobeyed her uncle and insisted upon burying Polynices anyway. Creon did everything he could to dissuade her, but ultimately could not convince her to give up her quest to bury her brother. The central point of the play is that Antigone believes in doing what she knows to be right, whereas Creon believes in doing what is necessary to maintain the peace in Thebes. Because Creon is committed to this goal, Antigone ultimately dies, making Creon ultimately the villain of the play.

Hope this helps!!