The Day of Destiny by Sir Thomas Morley.
-an excerpt from this work, describes the end of King Arthur's reign and the dissolution of the order which he, along with his Knights of the Round Table, he established. This end grows out of the corruption within the royal court itself. Arthur's illegitimate son Mordred knows of the secret love affair between Arthur's wife, Queen Guinevere, and his best friend, Sir Lancelot. One night, Mordred leads a band of knights to Guinevere's chamber where they find the Queen with Lancelot.