In “The Once and Future King” Arthur’s innocence turns to his biggest downfall letting his enemy to take an advantage. In Book 2 “The Queen of Air and Darkness”, Chapter 14 quote “It is why Sir Thomas Malory called his very long book the Death of Arthur. . .. It is the tragedy … of sin coming home to roost. . .. We have to take note of the parentage of Arthur’s son Mordred, and to remember … that the king had slept with his own sister. He did not know he was doing so … but it seems, in tragedy, that innocence is not enough.” The reader discovers that the women Arthur slept with was Morgause who’s in fact his half-sister, subtly representing Mordred family tree. In this unwitting sin Arthur committed, it foreshadows Mordred evil within,