Why did Sophocles write Anitgone?

Antigone, as the daughter of Oedipus, has lived a
challenging life, but she is strong and determined to do the right thing, which seems to
be a characteristic she shares with her father who was determined to find the
truth, even when the truth ended up destoying him.  Antigone is determined to see that
her brother is buried in a proper ceremony, even though it is a direct violation of the
orders given by her uncle, King Creon, who declared him a traitor and and a criminal to
the state.  Antigone knows that the laws of the gods are always more important than the
laws of man, and she refuses to apologize for her actions or back down in any way.  In
th end, she commits suicide rather than betray what she knows to be right. It is by
these actions that Creon sees the error of his ways and tries, too late, to save
Antigone.  Both the Oedipus stories and this one illustrate the theme of hubris, which
by a strict Greek definition is excessive pride -- pride that suggests that a person
thinks they know better than the gods.  Oedipus thinks he can out-wit the oracle of
Apollo, and Creon thinks that he can change the laws of buriel.  Both men live to suffer
with the knowledge of just how wrong they are, thus the series of plays in total
illustrates variations on that theme of the dnager of hubris.