Prospero tells Miranda, his daughter, as he is creating a storm that tosses a ship, that he used to be the duke of Milan and consequently Miranda was a princess. Indeed it is Prospero who creates the storm. The fact that they have been on an island for a long time lacking interaction with other people has made Miranda lack a judgment of her own. Propspero tells that he was victim of usurpation of his kingdom from Antonio, his brother. He is teaching his daughter that not all people are kind on the world and that Antonio was not a noble person.
