In the 2nd age of Middle-Earth, He was one of the great kings of men, a great sorcerer and ruler of the lands of Angmar, then he along with eight other kings of men were given the nine rings of power by Annatar the Lord of Gifts (Sauron in disguise). Eventually he became one of Sauron's ringwraiths, the greatest of the nine in fact. During his reign he continued to rule over Angmar with the fortress of Carn-Dûm being the very stronghold, he held his campaign rule over Eriador (The north of Middle-Earth) and lead his vast armies of orcs and men to lay ruin to the kingdom of Arnor.
He was the one who brought ruin to Amon-Sul, then he had befallen the foundations of the Dúnedain and the city of Fornost.
Eventually his dominion ended with the arrival of the armies of Gondor lead by Eärnur, joined by the remaining Dúnedain regiments and the elves of Lindon lead by Glorfindel.
Angmar fell, it's war-machine disbanded, and the Witch-King fled
Eärnur attempted to follow, but Glorfindel stopped him and had this to say:
- "Do not pursue him! He will not return to these lands. Far off yet is his doom, and not by the hand of man shall he fall."
- The Witch King holds a palantir; an object similar to a crystal ball. He uses it to contact others, including his master, Sauron, and Saruman; Who has a palantir of his own.
- The Witch King may very well be a Black Númenórean.
- He has an arsenal of different weapons; most notably his, "Morgul Knife", his mace, and a pale broad sword which can summon the flames of Udun it's self down to the handle.
- After Amon-Sul fell, it would later be remembered as the ruins of Weathertop.