PRINCE CASPIAN is the rightful King of Narnia whose father, King Caspian IX, is murdered by his own brother, Miraz, who makes himself King. Caspian's tutor, Doctor Cornelius, secretly teaches the boy about Narnia's past, and to protect the prince's life, sends Caspian away. Befriended by the Old Narnians and helped by Peter, Susan, Edmund and Lucy, Caspian defeats his enemies and becomes King Caspian X. He is later called Caspian the Seafarer, following his travels to the World's End.

"But who believes in Aslan nowadays?" said Trumpkin.
"I do," said Caspian. "And if I hadn't believed in him before, I would now. Back there among the Humans the people who laughed at Aslan would have laughed at stories about Talking Beasts and Dwarfs. Sometimes I did wonder if there really was such a person as Aslan: but then sometimes I wondered if there were really people like you. Yet there you are."
"That's right," said Trufflehunter. "You're right, King Caspian. And as long as you will be true to Old Narnia you shall be my King, whatever they say. Long life to your Majesty."
After a pause Caspian heard the sound of hoofs. It grew louder till the valley trembled and at last, breaking and trampling the thickets, there came in sight the noblest creatures that Caspian had yet seen, the great Centaur Glenstorm and his three sons.
"Long live the King," Glenstorm cried. "I and my sons are ready for war. When is the battle to be joined?"