Gwydion/Mordred
This is Morgaine and Arthur's son from the kingmaking on Dragon Island. After a difficult birth, Morgause tricks Morgaine into letting a wet nurse take care of him, so the connection between mother and child is never formed. As a result, Morgaine freely leaves Gwydion with Morgause to raise as her foster-son. He has Lancelet's looks and Morgaine's wit. However, there is something sinister beneath his cool exterior that tends to put some people off. He grows up in Lothian under Morgause's tutelage and grows shrewd to her ways. As he grows up, it is discovered that he is strong in the Sight. He keeps this information to himself until the day that Viviane, Niniane, and Kevin go to Lothian to meet Gwydion and take him back to Avalon for training. Unlike Morgause's other sons, Gwydion is like a cat--silent, sleek, fastidious, and watchful.
Gwydion realizes that his father is Arthur and this tends to overawe him. The prophecy says that he will unseat Arthur, and Gwydion is nervous about this because Arthur is beloved by all. Eventually, as he grows closer to Arthur, he discovers Gwenhwyfar's affair with Lancelet, which makes his blood boil. To prevent Arthur from becoming the laughingstock of the kingdom, Gwydion vows to expose Gwenhwyfar and Lancelet's affair, thus upsetting the Companions and causing a rift at court. Gwydion, now called Mordred, meaning "Evil Counsel," takes this opportunity to battle Arthur for the crown. During their battle, Gwydion/Mordred dies, and Arthur sustains a mortal wound, which he dies from shortly after. Gwydion/Mordred, in effect, puts a permanent end to Camelot.
Gwydion realizes that his father is Arthur and this tends to overawe him. The prophecy says that he will unseat Arthur, and Gwydion is nervous about this because Arthur is beloved by all. Eventually, as he grows closer to Arthur, he discovers Gwenhwyfar's affair with Lancelet, which makes his blood boil. To prevent Arthur from becoming the laughingstock of the kingdom, Gwydion vows to expose Gwenhwyfar and Lancelet's affair, thus upsetting the Companions and causing a rift at court. Gwydion, now called Mordred, meaning "Evil Counsel," takes this opportunity to battle Arthur for the crown. During their battle, Gwydion/Mordred dies, and Arthur sustains a mortal wound, which he dies from shortly after. Gwydion/Mordred, in effect, puts a permanent end to Camelot.