Board Thread:General Discussion/@comment-25926288-20151130020049/@comment-1894786-20151130205203

Also, Lancelot himself says in "Lady Of The Lake" that his mother raised him by the shores of a lake... Are you people not watching the show? Also, 5A has established that David (Nolan) knows of Arthur and Guinevere. So it's safe to assume that Mary Margaret also had memories of reading "the old story" as Guinevere called it, and y'know... Put two and two together?

Though the Lady of the Lake, who is Lancelot's adoptive mother, is supposed to be Nimue. Which in Once, is obviously not the case. Unless they pull an Ursula and have two women named Nimue.