Tiresias is the iconic blind seer, the guy who may not be able to see his hand in front of his face, but can see pretty much everything that's going to happen. Though he's super old and has been trying to advise the kings of Thebes for years, they never seem to listen to his advice, which we're guessing is the very thing that makes him so cranky all the time. In this story, we see Creon make the same mistake that so many other kings of Thebes have made before him by not listening to Tiresias. Though the prophet warns Creon that he'll lose his family if he punishes Antigone, Creon goes ahead and does it anyway.
For the full story on the blind seer of Thebes click here. To see how he butts heads with Oedipus in Sophocles' Oedipus the King click here.