Morgause
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In Arthurian legend, Morgause or Morgase (also known as Anna or Anna-Morgause) is the half-sister of King Arthur who slept with him and produced Mordred, the heir who would bring Camelot's downfall. She is the daughter of Gorlois, Duke of Cornwall and Lady Igraine. She is married to King Lot, an enemy of Arthur in the rebellions following Arthur's coronation.
Her siblings include sisters Elaine and Morgan le Fay, and her half brother Arthur, the product of her mother's unknowing affair with Uther Pendragon. The later material gives her five children, all sons, while earlier works named daughters as well. From eldest to youngest, the sons of Morgause are Gawain, who becomes one of King Arthur's greatest knights, Agravaine, a wretched traitor, Gaheris, Gareth, and Mordred, her son with Arthur. Her children play key roles in the story of Arthur and his kingdom. She is active in Thomas Malory's Le Morte d'Arthur, and the Vulgate and Post-Vulgate versions of Merlin.
In Le Morte d'Arthur and the Post-Vulgate, her husband is killed by King Pellinore in battle, starting a blood feud between the families of Pellinore and Lot. Pellinore is killed by Gawain and Gaheris, and Morgause later has an affair with Lamorak, son of Pellinore and one of the best knights of the Round Table. Her son Gaheris catches them together, and kills Morgause in bed, though he lets Lamorak go. Thinking it is Lamorak who killed their mother, Gawain, Agravain, and Mordred (Gareth takes no part) join Gaheris to ambush Lamorak and kill him. The brothers do eventually find out that Gaheris was the real killer, and he is banished from the court (though he appears later in the narrative).
In modern variations, Morgause's character is sometimes combined with Morgan le Fay's, and her role as the mother of Mordred is transferred to Morgan.
T. H. White named one of the four volumes in The Once and Future King as The Queen of Air and Darkness, in reference to Morgause.