Rystil Arden
First Post
Unfortunately I don't have an answer either, at least not a good one - while I'm tempted to say that perhaps Morgan had gender reassignment that the Arthurian saga overlooks, I think it's more likely that it's something to do with the possessive article in Old French.
I can tell you with absolute certainty (or at least as close as we can ever get on anything from the past) that Morgan did not undergo gender reassignment. You probably don't care about the Celtic sources that led to the later French where she was female, so I won't go into it.