I've been rewatching the series & I feel like I've missed out whether or not Morgana or even Morgause knew about the prophecy of Arthur restoring magic to the kingdom & creating Albion.
Somehow, either way whether they knew or not, there'd be plot holes;
If Morgana did know, why would they still be against Arthur?
If Morgana didn't know, why wouldn't it have been possible to tell her & persuade her off of the path she was treading?
She takes all the other prophecies fairly seriously e.g. Emrys being her destiny and her doom, so there wouldn't be much cause for her to immediately disregard the prophecy had she known?
Sub question: Who in the series actually knew of the prophecy for Arthur and Merlin to bring about Albion and where did it come from?