Originating from the French chivalric romances of the 13th century and made prominent today through its inclusion in Le Morte d'Arthur, Mordred is a power-hungry son of Arthur from the incest with Morgause, prophesied by Merlin and destined to bring Britain to ruin. He survives Arthur's attempt to get rid of him soon after his birth and, years later, joins his half-brothers Gawain, Agravain, Gaheris and Gareth in Arthur's fellowship of the Round Table as a young and immoral knight. Eventually, Mordred learns of his true parentage and becomes the main actor in Arthur's downfall. He helps Agravain to expose the illicit love affair between Guinevere and Lancelot and then takes advantage of the resulting civil war to make himself the high king of Britain, ultimately leading to both his own and Arthur's deaths in their battle. - Source: Wikipedia, Image: Sir Mordred by H.J. Ford