User blog comment:Knightofthecart/Morgana has turned her back/@comment-4879894-20120314125525/@comment-4892425-20120314194630

It could be a lot of reasons. Morgana may think she is more capable than Arthur in being the sovereign but the hinderance is her gender. That would have been a problem even if she was born on the right side of the blanket. But I think overall her anger and resentment has screwed up her judgment. Lest not forget, since she is also not Gorlois' legitimate daughter, she couldn't inherit Gorlois' monies and estates. (I wonder if that's the reason Uther made her his ward: thanks to his lust Morgana was doubly dowry-less, damaged goods on the marriage market.  He took her in out of guilt.)  Under the circumstances, she can only get the throne if Arthur is dead and he dies without a legitimate heir. She wants Gwen out of the way because Queen Gwen would be the one that provides the heir. Mithian was a potential target because of the arranged marriage to Arthur; but Morgana has the vision that Gwen is Arthur's consort, not Mithian.

I would love to see Morgana's illegitimacy thrown in her face in Season 5. That would really set off the nastiness in Morgana.