The Pale King

The Pale King was the ruler of Hallownest, mate to the White Lady, and ruler of the White Palace. After the infection spread across his kingdom, he retreated to his palace where he died of unknown causes.

Trivia

 * The Pale King was reincarnated from the Wyrm in the Kingdom's Edge.
 * As the Radiance continued to try and break free, the King grew more and more desperate and took darker and darker measures to contain it.
 * It is unknown how he died, although because his final words when Dream Nailed are "No cost too great...", it can be assumed that he made a sacrifice of sorts.
 * As mentioned by the Relic Seeker Lemm, the White Palace seemed to have vanished or disappeared, rather than being physically destroyed.