Which sentence uses a semicolon correctly?

(Remember, a semicolon joins two complete sentences.)

Never before had such a case occurred had a subject dared to love; the daughter of the king.

She didn't know if it would be better for him to die; she couldn't handle him married to the lady.

The daughter of the king was very sad, but never; showed it.

She didn't know if it would be better for him to die; she couldn't handle him married to the lady.