Mordred, also called Sir Mordred is one of the most famous antagonists of Arthurian legend and the one directly responsible for the great King Arthurs death - he is often envisioned as either a rival or archenemy of Arthur depending on the legend.
What monsters did King Arthur fight?
King Arthur has fought against many things: kings, emperors, giants, dragons, magical boars, just to name a few. But among all the great warriors and monsters that have tried to conquer the Once and Future King of Britain, not many come as close to killing Arthur as a black kitten – the Cat of Palug.
Did Arthur and Guinevere have a baby?
But when Geoffrey of Monmouth took up the legend in 1136, he named Mordred as Arthurs nephew, who, with Guinevere, attempts to betray him and seize his kingdom. The Historia Brittonum states that Arthur had a son named Amr, whom he killed and buried, though it does not state the reason for the conflict.