Few of the Nazgûl are named or identified individually in Tolkien's works. Their chief, also known as the Lord of the Nazgûl and the Black Captain, appears as the Witch-king of Angmar during the Third Age, instrumental in the destruction of the North-kingdom of Arnor. In "Unfinished Tales", his second-in-command is named as Khamûl, the "Black Easterling" or the "Shadow of the East". Three of the Nazgûl were great Númenórean lords; in his notes for translators, Tolkien speculated that the Witch-king of Angmar, ruler of a northern kingdom with its capital at Carn Dûm, was of Númenórean origin.