Sauron may not be the greatest Dark Lord in the world of The Lord of the Rings, but by the Third Age, he was the ultimate source of darkness. Accordingly, when his power began to grow for the second time, Sauron drew to himself all of the evil things in Middle-earth -- among them, Orcs, Saruman the White and a Black Númenórean known as the Mouth of Sauron. However, his greatest servant was none other than the Witch-king of Angmar, leader of the Nazgûl.