User blog comment:Moon765/Arthur and Morgana are related!/@comment-45048151-20200603025900/@comment-78.145.197.255-20200627124300

Well spotted. Good catch.

The King Arthur wiki, one devoted to the written legends, describes Mordred as being Arthur's and Morgause's son, and that it was Morgause who was Arthur's half-sister.

But yeah - it was still with a half-sister, so my lunch didn't sit well with me either. I could never ship Arthur and Morgana in my fanfic, any more than I could ship him and Morgause.

''Mordred or Modred (/ˈmoʊdrɛd/; Welsh: Medraut, Medrod, etc.) is a character in the Arthurian legend, known as a notorious traitor who fought King Arthur at the Battle of Camlann, where he was killed and Arthur fatally wounded. Tradition varies on his relationship to Arthur, but he is best known today as Arthur's illegitimate son by his half-sister Morgause, though in many modern adaptations Morgause is merged with the character of Morgan le Fay. In earlier literature, he was considered the legitimate son of Morgause, also known as Anna, with her husband King Lot of Orkney. His brothers or half-brothers are Gawain, Agravain, Gaheris, and Gareth. The name (from either Old Welsh Medraut, Cornish Modred, or Old Breton Modrot) is ultimately derived from Latin Moderātus.''

(If you want to look up the reference at Quondam et Futurus:- https://kingarthur.fandom.com/wiki/Mordred#:~:text=Mordred%20or%20Modred%20(%2F%CB%88mo%CA%8Adr%C9%9Bd,killed%20and%20Arthur%20fatally%20wounded.)