Prince Caspian is the heir to the throne of Narnia, currently held by his uncle, King Miraz. Caspian is interested in mythical creatures, but his uncle forbids all stories telling of their existence. When his uncle finally has a son of his own, Caspian has to flee in fear of being killed. After encountering some creatures he thought mythical, and them accepting him as their rightful king, he uses a magical horn given to him before he fled, to summon the kings and queens of old back to Narnia to help defeat his uncle. With Aslan's help, Caspian defeats his uncle, and Caspian is crowned King Caspian.
The Lion, Witch and the Wardrobe, and Prince Caspian