Board Thread:Spoilers!/@comment-4877635-20150218173447/@comment-25624943-20150220005515

101Pugs2015 wrote: I posted this theory on another forum but, what if Lily is the daughter of Merlin? It would make sense if when Rumple visited Camelot he planned to destroy his rival Merlin. But when he found the gauntlet it led him to the thing Merlin loved most, Lily. Then to protect Lily Merlin was forced to send her to LWM. It also would make sense if Merlin was the sorcerer cause then Lily's birthmark would make even more sense.

Great theory! It makes sense

Or maybe Lily is also Morgan le Fay aka Black Fairy, who is the sister of... Merlin. After Blue Fairy defeated her and took her wand, she became "normal" and non-magical, but Merlin still loved her. And Rumple came to Camelot and everything happened as you say...