The half-human, half-monster son of the banished witch Sycorax in Shakespeare's The Tempest, one of the only Shakespearean figures to come to have its own literary existence outside of the work for which it was created. Caliban's mother dies shortly before the arrival of Prospero, the rightful Duke of Milan, and Caliban's subsequent enslavement. Caliban worships Setebos, the entity he believes to be his mother's god, and appeals to her powers to free him from Prospero's torment.