Who is Jocasta (from The Phoenician Women) from Euripides V and what is their importance?

Jocasta is Oedipus' wife, as well as the mother of Antigone, Polyneices, and Eteocles. Once married to Laius, who was given a prophecy that if he bore a son, his son would kill him, Laius and Jocasta left their infant son on a mountain to die because of the prophecy. The son, however, was saved and raised by foster parents to be Oedipus. Oedipus later met Laius on the road by accident, argued with him and killed him, thus the prophecy was fulfilled. Then,

Oedipus went on to save the city of Thebes from the Sphinx and was rewarded for his victory with an advantageous marraige..... to Jocasta. Unaware that Jocasta was, in fact, his mother, Oedipus gouged out his own eyes when he learned the truth. His sons then imprisoned him in his palace.