Witch-king of AngmarThe Witch-king of Angmar - But, of course, it was eventually learned that the King of Angmar was also the Black Captain, Chieftain of the Ringwraiths.

 

"'Yet now under the Lord of Barad-dûr the most fell of all his captains is already master of your outer walls,' said Gandalf.  'King of Angmar long ago, Sorcerer, Ringwraith, Lord of the Nazgûl, a spear of terror in the hand of Sauron, shadow of despair.'

 

"In rode the Lord of the Nazgûl.  A great black shape against the fires beyond he loomed up, grown to a vast menace of despair.  In rode the Lord of the Nazgûl, under the archway that no enemy yet had passed, and all fled before his face.

 

"All save one.  There waiting, silent and still in the space before the Gate, sat Gandalf upon Shadowfax; Shadowfax, who alone among the free horses of the earth endured the terror, unmoving, steadfast as a graven image in Rath Dinen.

 

"'You cannot enter here,' said Gandalf, and the huge shadow halted.  'Go back to the abyss prepared for you!  Go back!  Fall into the nothingness that awaits you and your Master.  Go!'

 

"The Black Rider flung back his hood, and behold!  he had a kingly crown; and yet upon no head visible it set.  The red fires shown between it and the mantled shoulders vast and dark.  From a mouth unseen there came a deadly laughter.

 

"'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 Return of the King, Book I, Chap. 4 (The Siege of Gondor)