Board Thread:General Discussion/@comment-5674726-20150813192004/@comment-5674726-20151221191648

Another theory: Morgana was Uther's punishment from the Disir.

When the Disir judged Arthur, he was offered a choice between accepting magic/the Old Religion and Mordred's death. Although he did not accept their terms, Mordred was still restored to health. I believe that Mordred's life was never in danger; Arthur's choice determined whether Mordred would live as his friend or whether he would become his enemy and, in time, kill him.

I could see something similar happening with Uther, who would not have heeded any summons by the Disir, if one was issued. As punishment for the Great Purge, he was given a daughter with magic, one that he would love - it's quite possible that they may have influenced Gorlois' death to ensure that Uther's daughter would be part of his life from childhood so that he would grow attached to her - and his actions towards magic and/or the Old Religion would determine whether he would have a loving daughter or an enemy who would destroy him.

Vivienne had some involvement with the Old Religion so who is to say that she was not instructed to conceive a child with Uther?