* Ovid's *Metamorphoses*. Shakespeare was familiar with Ovid's *Metamorphoses*, a collection of Greek and Roman myths. Several elements of *The Tempest* are inspired by Ovid's stories, including the character of Caliban, who is based on the Cyclops Polyphemus, and the transformation of Ferdinand into a spirit Ariel.
* Renaissance magic and alchemy. Shakespeare's plays often incorporate elements of magic and alchemy. In *The Tempest*, Prospero uses his magical powers to control the island and its inhabitants. These magical elements are based on the beliefs and practices of Renaissance magicians and alchemists.