“Did he try to kill you because of your affair? Or because he found out you gave me this elixir?” “I don’t know,” she whispered. “He came to my bedroom in a rage. It escalated when he saw Mikhail.”
Flash back to his father repeatedly saying "you killed him"... initially we thought it was about her affair, but maybe he was referring to her killing Ransom by giving him the elixer. The king knew what she had done.

