Slavery in The Tempest Slavery occurs on a widespread basis in The Tempest. Occurrence of slavery to many of the characters, all in different ways, helps to provide the atmosphere for the play. The obvious slaves are not the only slaves, as Prospero has basically got everybody entranced when he wants, to do whatever he wants with them. He can also control the way that they think. The first and most obvious slave is ariel. Ariel is an airy spirit who is promised his freedom by Prospero if his job is done well. His job was to entrance the visitors to the island under Prospero's control. "Wh