As the princess, you were forced to marry a man you didn't love.

However, the knight secretly loves you and is jealous of the man who married you.

She was planning to kill the man tonight.   You were in your room getting ready for bed when you heard knocking on your door. You opened the door and saw her there, holding a bouquet of roses in her hand.   "My lady, I have come with a gift for you." Her voice was gentle.   You see a bit of blood on the roses.