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The "Nine" refers to the Nazgûl, also known as the Ringwraiths or the Nine Riders, fictional characters from J. R. R. Tolkien's Middle-earth legendarium. They were nine men who were given Rings of Power by the Dark Lord Sauron. Over time, these Rings corrupted them, turning them into invisible wraiths, bound to Sauron's will and serving as his most terrible servants. Their leader was the Witch-king of Angmar. These nine rings granted the men immortality but at the cost of their humanity and visibility in the physical world, making them shadows under Sauron's command. The nine men who became Nazgûl were likely kings, sorcerers, or warriors of old. Tolkien mentioned that three of them were great lords of Númenórean descent. The rest are believed to be powerful leaders or rulers from various regions, possibly including the East, South, and other parts of Middle-earth, who were corrupted by Sauron's power through the rings. In summary, the Nine were once powerful mortal men who became immortal servants of Sauron through their Rings of Power, eventually becoming the feared Nazgûl or Ringwraiths in Tolkien's lore.