The document discusses villains in the legend of King Arthur. It describes Mordred as the villain who betrayed King Arthur by crowning himself king and marrying Arthur's wife Guinevere while Arthur was away battling. When Arthur returned, he fought Mordred in the battle of Camlann, where Mordred was killed. The document also provides characteristics that villains may possess, such as being rude, aggressive, disloyal, dishonest, mischievous, cruel, evil, and dark.