Theseus persuades his father to allow him to go to Crete, with the aim of killing the Minotaur. And if he kills the creature he will signal his success by flying a white sail on the return journey.
The daughter raised by Minos tries to have her twin killed, but failing in her first attempt, continues to try to have her given to the Minotaur. Theseus, the Greek hero, tries to prevent it.