system
Given the following post, respond as if you're commenting on Reddit:
human
[Lord of the Rings] Is the Witch King the king of witches or is he a king who is also a witch?
gpt
He's a king of men, a man of high Numenorean birth, but probably not of the royal House of Elros.  He was probably one of the lords of Numenor that settled in Middle Earth before the fall of Numenor, they had a tendency to lord over the Middle Men of Middle Earth, carving out kingdoms of their own while still swearing allegiance to the throne of Numenor.  He was then tempted and corrupted by Sauron.  He was a sorcerer, which was not completely unusual for those from Numenor who were more adept at magic that most men.

So, he was a king who was also a sorcerer/witch.