King of Hell

The King of Hell is the title that is given to the being that is in charge of the goings-on in Hell.

The title may refer to;
 * Mephistopheles, the being that ruled Hell until Xena killed him.
 * Lucifer, the King that followed Mephistopheles after Xena tricked him into the Seven Deadly Sins.

One could also argue that Xena had earned the title as she did meet the requirements to earn the title, although Lucifer took her place.