During a tempest, Alonso, King of Naples, and Antonio, Duke of Milan, are shipwrecked on an enchanted island. This has all been engineered by Prospero, a magician who lives there with his daughter Miranda. Years before, Prospero had been unfairly exiled from his Dukedom of Milan by his brother Antonio and, on the island, had met the witch Sycorax, who lived there with her son Caliban and the imprisoned spirit of the air Ariel. Prospero released Ariel, who became his agent, and used Caliban as a servant.