Emperor-Beyond-The-Sea

The Emperor-beyond-the-Sea (also called the Emperor-over-the-sea) is the father of Aslan, who created the Deep Magic and put it into Narnia at the time of its creation. His sceptre was said to have the Deep Magic engraved upon it.

The title Emperor, and Aslan's relation to him as "the son of the Emperor-over-the-sea, the King above all High Kings in Narnia", seems to imply that the Emperor is the ruler of all worlds. The significance of "beyond the sea" is never made clear by C. S. Lewis, but gives the sense that he is beyond the world.

When Edmund talks to Eustace about Aslan on Caspian X's voyage to the end of the world, he mentions that Aslan is the son of the Emperor-beyond-the-Sea, and that they may be sailing to Aslan's Country, which they eventually see beyond the edge of the Great Eastern Ocean at the End of the World. Doctor Cornelius also advised Prince Caspian that "every story says that Aslan is the son of the great Emperor-over-the-Sea, and over the sea he will pass."

Though the Deep Magic gave the right to the Witch Jadis to kill traitors (including Edmund), Aslan disapproved of the very idea of working against the Emperor's Magic, although it's possible he only said that because he knew it could not be done, and instead relied upon deeper magic still, from before the dawn of Time.

Trivia

 * The Emperor-beyond-the-Sea represents God the Father, with Aslan (the Emperor's son) as Jesus Christ. In the same way, the Emperor's Deep Magic (the Law given to Moses) is overruled by the death of his son Aslan (the crucifixion of Christ).
 * The Emperor is mentioned in five of the seven novels, only missing in The Silver Chair and, notably, The Magician's Nephew, but he does not appear in any of them.
 * The Emperor-beyond-the-Sea is yet to be mentioned in any film adaptations.
 * In The Lion, the Witch and the Wardrobe (book), Jadis states that the Emperor was the one who put the magic into Narnia at the beginning, which Aslan also claims is true, yet in The Magician's Nephew Aslan was the one who brought Narnia to life. However, it is possible the Emperor may have been working through him.