What is the irony of the story? (there is more than one main irony example)

Oh, indeed, this
play is replete with .flees Corinth, believing he's escaping the prophecy by running away from
his parents, but he doesn't know that Polybus and Merope are his adoptive parents. Oedipus then
runs right into Laius, his real father, whom he kills, and is awarded the queen of Thebes,, when
he solves the riddle of the Sphinx. She, unfortunately, is his...