When Eärnur and Glorfindel drove the hosts of Angmar from the fallen North-kingdom, they eradicated the Angmarim west of the Misty Mountains. A short time later, however, the ancestors of the Rohirrim pressed northward on the far side of the mountains and drove the remaining Angmarim back into their former realm, though they were now scattered and few. Over the long years, the remnants of Angmar began to multiply and grow strong again, and built towns and villages once more.
Rhunendin is one such town, guarding the western approach to the Witch-king's former capital of Carn Dûm. The Angmarim remain faithful to their banished lord and serve his Steward, Mordirith, called the False King by the Hill-men who also dwell in Angmar. Rhunendin is a mighty bastion against those who would overthrow Angmar once more.