Arthur does know it and all Merlin wanted to do was get his magic back so he could save Arthur!<<<< I feel like Arthur never even considered making Merlon a knight because he didn't want Merlin to get hurt
She was the darkness to his light. Her insanity was so perfectly paralleled to his sorrow. Merlin loses everything, Morgana gives it all up in pursuit of power. I love Merlin and Morgana they are my two favorite characters.