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. The Deep Magic was engraved upon his sceptre. Though the Deep Magic gave the Witch Jadis the right to kill traitors (including Edmund), Aslan strongly refused to work against his father's magic, and instead relied upon Deeper Magic from Before the Dawn of Time, which was presumably also the Emperor's.

The Emperor lives beyond the eastern edge of the Narnian world, and he is the ruler not only of Narnia, but of all worlds.

Doctor Cornelius told Prince Caspian that "Aslan is the son of the great Emperor-over-the-Sea, and over the sea he will pass." Later, when Edmund talked to Eustace about Aslan on Caspian's voyage to the end of the world, he mentioned that Aslan was the son of the Emperor-beyond-the-Sea. One purpose of the voyage was Reepicheep's desire to find Aslan's Country by sailing across the Great Eastern Ocean to the End of the World.

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. The Deep Magic is not mentioned in The Magician's Nephew, however, and it is possible the Emperor may have been working through him.
 * When Susan suggested working against the Emperor's Deep Magic, it is possible that Aslan only replied "Work against the Emperor's Magic?" because he knew it could not be done, but the way that he turned to her "with something like a frown on his face", and "nobody ever made that suggestion to him again" imply that he disapproved of the very thought of working against his father.