What are the themes of Julius Caeser and Antigone?

I think one of the themes for antigone is that everyone has their own sense of justice, which is not necessarily right (Antigone thinks burying her brother is justified, but Creon thinks punishing Antigone is justified). Also divine law vs. King's law (Antigone says the gods would want her to bury her brother but Creon says he's the ruler, people have to listen to him).