Merlin predicts that Guinevere will somehow be the cause of Arthur 's downfall .
He is nursed by the lord 's daughter , Guinevere , whom Arthur falls in love with and pledges to marry .
Merlin predicts that Guinevere will somehow be the cause of Arthur 's downfall .
He is nursed by the lord 's daughter , Guinevere , whom Arthur falls in love with and pledges to marry .