Polybus being childless adopted the boy, who grew up believing that he was indeed the King’s son. Afterwards doubting his parentage he inquired of the Delphic god and heard himself the word declared before to Laius. Wherefore he fled from what he deemed his father’s house and in his flight he encountered and unwillingly slew his father Laius. Arriving at Thebes he answered the riddle of the Sphinx and the grateful Thebans made their deliverer king. So he reigned in the room of Laius, and espoused the widowed queen