Khamûl was the Ringwraith who was second-in-command to the
Witch-king. He was also known as the Black Easterling and Shadow
of the
East.
During the Second Age, he fought for Sauron until
Sauron was overthrown.
In the Third Age, brought back, he may have been
Sauron's chief lieutenant in Mirkwood. After 2951,Khamûl was the
Lord of Dol Goldur.
During the hunt for the One Ring, he entered
Hobbiton and nearly caught Frodo, the Ringbearer, at Bucklebury Ferry.
After the Witch-king's destruction at the Battle of the
Pelennor Fields, Khamûl became the new captain of the Nazgûl. He
led as they flew into battle at the Black Gate. All were
destroyed
when the One Ring which held their forms together fell into the Crack
of
Doom.