What made Oedipus go to the oracle when he was young?

It is
revealed to the reader during a conversation betweenandthat Oedipus went to the Oracle of Delphi
because of a rumor that he heard at a feast. One of the people attending the feast, who had
become quite drunk, claimed that Oedipus's parents, Polybus and Merope, were not actually his
biological parents. Oedipus initially asks Polybus and Merope, but he remains discontent with
their answer, so he journeys to the Oracle to learn the veracity of this rumor.

Though Oedipus does receive an answer to his query, he is appalled at the information
that the Oracle does share with him. It is from her that Oedipus hears the prophecies that he
will murder his father and bed his mother. These revelations drive Oedipus from his adopted
parents directly toward Thebes, where his actual parents reside, thus causing the prophecy to
come to pass.