The end of ancient feuds (Godric Gryffindor)

It's a well known fact that Slytherin and and Gryffindor have never gotten along. Slytherin's find Gryffindor's too chivalrous and Gryffindor's think that Slytherins are all evil.
But what happens when a prophecy is brought to light. One that will change the course of destiny and end the rivalry between these two houses.

godric Gryffindor x oc