Frank Stockton's "The Lady or the Tiger" tells of a semi-barbaric king, his daughter, and the young man the daughter loves. Since it against the king's law for a peasant to love a noble, the young man is tried in the king's very original court.
The princess knows that her lover faces either a tiger or a lady (who he will be forced to marry). The princess hates the lady for many reasons. First, she believes that she has seen the lady "raise her eyes" to the young man. The princess hated her for this. Also, the lady is known to be the most beautiful of the lands. Essentially, it is the princess's jealousy which fuels her hate of the lady behind the door.