J.R.R. Tolkien, The Lord of the Rings, The Return of the King, " The Siege of Gondor", p. 819 and p. 829 J.R.R. Tolkien, The Lord of the Rings, Appendix A, "The Númenorean Kings", "Gondor and the Heirs of Anárion", entry for King Eärnur, p. 1052 Wayne G. Hammond and Christina Scull (eds), The Lord of the Rings: A Reader's Companion, citing from The Hunt for the Ring, pp. 180-1

In TA 2043, King Eärnil II of Gondor passed away and his son Eärnur, the Witch-king's old foe, inherited the throne. Upon his coronation, the Lord of the Nazgûl challenged the new king to single combat, but Eärnur refused. However, seven years later in TA 2050 he challenged Eärnur again, and Eärnur accepted. Gondor's king rode out of Minas Tirith to meet his enemy in combat at Minas Morgul. He entered and was never seen again. Thus ended the reign of the Kings of Gondor and the rule of the Stewards of Gondor began. In TA 2063 the Watchful Peace began when Sauron fled Dol Guldur to avoid the investigations of Gandalf and hid in the East, and the Nazgûl remained quiet in Minas Morgul for the next 400 years.Wayne G. Hammond and Christina Scull (eds), The Lord of the Rings: A Reader's Companion, "Fog on the Barrow-downs", pp. 144-5; Index, 'Cardolan, last prince of' J.R.R. Tolkien, The Lord of the Rings, Appendix A, "The Númenorean Kings", "Eriador, Arnor, and the Heirs of Isildur", The North-kingdom and the Dúnedain, entry for King Arvedui and entry for Chieftain Aranarth, pp. 1041-3 Wayne G. Hammond and Christina Scull (eds), The Lord of the Rings: A Reader's Companion, citing from The Hunt for the Ring, p. 195-6 J.R.R. Tolkien, The Lord of the Rings, Appendix A, "The Númenorean Kings", "Gondor and the Heirs of Anárion", "The Stewards", entry for Steward Boromir, p. 1053

Wayne G. Hammond and Christina Scull (eds), The Lord of the Rings: A Reader's Companion, citing from The Hunt for the Ring, p. 167-8 The Witch-king confronts Gandalf and Pippin at Minas Tirith Films The Lord of the Rings film trilogy " Do you not know death when you see it, old man? This is my hour! You have failed. The world of men will fall." — The Witch-king to Gandalf in the The Lord of the Rings: The Return of the King By now the northern Dúnedain realm of Arnor, sister-kingdom to the southerly Gondor, had already become split into three warring successor states – Rhudaur, Cardolan and Arthedain. It was into this febrile situation that the Lord of the Nazgûl reappeared in TA 1300 and began to fulfil Sauron's plan to bring down the North-kingdom altogether. Adjacent to its territories he founded the dark domain of Angmar – where, from his capital of Carn Dûm, he began his campaign of open war against the Dúnedain of Arnor. It was during this series of conflicts that they labelled their new enemy's undead sorcerer-chieftain with the title of "Witch-king, Lord of Angmar". Old fool!' he said. 'Old fool! This is my hour. Do you not know Death when you see it? Die now and curse in vain!' And with that he lifted high his sword and flames ran down the blade.The Lord of the Rings: War of the Ring: Witch-King is one the main "Hero" units for the Servants of Sauron, his signature ability is being able to turn Wights into Nazgûl. The evil campaign storyline shows him reclaiming Dol Guldur for Sauron. J.R.R. Tolkien, Christopher Tolkien (ed.), The Peoples of Middle-earth, "VII. The Heirs of Elendil", entry for Malvegil, pp. 193-194