One of the most pivotal antagonist in the tale of middle earth would have to be the witch king of Angmar a men who once lead the armies of men but fell to the taint of one of the nine rings of power given to corrupt by Sauron. Following the defeat of the darklord in the second age the Witch King fled back to his territory of Angmar were he ruled for thousands of years until being called to drive the forces of Mordor against the war of the one ring.The Lord of the Nazgûl reentered in TA 1300 in the north adjacent the lost realm of Arnor. There he organized the kingdom of Angmar. It was after the creation of Angmar and various conflicts with the Dúnedain of the Northland that the Lord of the Nazgûl took the title of Witch-king, Lord of Angmar.He then started his open war operations with the three divided kingdoms of Arnor (Arthedain, Rhudaur, and Cardolan). In TA 1356, the Witch-king overran the kingdom of Rhudaur and substituted the Dúnedain king of the land with a hill chief associated to Angmar. King Argeleb of Arthedain was slain trying to protect Rhudaur against Angmar. In TA 1409 the companies of the Witch-King struck the fortress of Amon Sûl and roasted the tower, during which battle King Arveleg of Arthedain was killed. Its not like now when you have ways of commnicating through devices and the means of fixing them with these phone repairs shop.
The Witch-King then penetrated and dissolved the realm of Cardolan. Then the Witch-King invaded Arthedain and came close to killing it, but King Araphor with the aid of the elves of Lindon and Rivendell maintained to defeat the invading forces.
Soon, the only opposition facing the Witch-king’s armies was the western kingdom of Arthedain. The Witch-king renewed his war for hundreds of years. In TA 1636, the Witch-king sent wights to the Barrow-downs in Cardolan to stop the restoration of the kingdom. The Witch-king maintained ultimate supremacy in the north in TA 1974 when his forces took Fornost Erain, the center of Arthedain. With its occupation, the final kingdom fell, and with it, the last traces of the lost realm of Arnor were finished. The Witch-king happily took his seat of power in the recently captured Fornost. But his fame did not last long, for, in TA 1975, general Eärnur of Gondor docked at the harbors of the Grey Havens, heading an army of Gondor. His army was accompanied by the Elves of Lindon and the remains of the northern Dúnedain and advanced on the Witch-king.