Does Oedipus have the right to be king? He saved the kingdom, but also killed the king and who was his father and then married the queen (his...

I believe that Oedipus does have the right to be king. When he
was an infant, a prophecy informed the King (Laius) and Queen (Jocasta) of Thebes that their son
would kill his father and marry his mother. So the King did all he could to have the infant
killed. (Without their knowing, Oedipus does not die, but ends up in the palace of Corinth, where
he is adopted by the king there.)

Later, as a young man, Oedipus is
attacked and kills the stranger and the slave who attacked him. When he solves the riddle of the
Sphinx who had terrorized travelers for so long, he is welcomed to Thebes, and is encouraged to
marry Jocasta. He has no idea this is his mother.

It is only after
receiving the news of his part in his father's death, and then realizes that he is married to his
mother, that Oedipus gives his throne to his uncle (Creon), blinds himself as punishment, and
banishes himself from his kingdom.

Oedipus did not knowingly kill
his father and marry his mother. In fact, it was his parents who were at fault—by trying to kill
him, fate brought Oedipus to the crossroads to defend himself against his father's attack, and
then on to solve the Sphinx's riddle. Had he lived with his parents all his life, this would not
have happened.