Sauron: The Lord of the Rings
Sauron, originally named Mairon, was a spirit of the order of Maia, associated with the smith-god Aulë. From his origins, he possessed a deep love for order and coordination, but this virtue was twisted into a hatred of all friction and dissent. This desire for control led him to become the chief lieutenant of the first Dark Lord, Morgoth, during the First Age.
The Deceiver and the Rings of Power
After the defeat of Morgoth, Sauron hid in Middle-earth rather than face the judgment of the Valar. In the Second Age, he assumed a "fair form" and took the name Annatar, the Lord of Gifts. He infiltrated the Elven-smiths of Eregion, teaching them the secret arts of craftsmanship.
Under his guidance, the Rings of Power were forged. However, in the fires of Mount Doom, Sauron secretly forged the One Ring to rule them all. When he placed it on his finger and uttered the Ring Verse, his treachery was revealed, sparking the devastating War of the Elves and Sauron.
The Fall of Númenor and the Last Alliance
Sauron’s power grew until he was challenged by the might of Númenor. Realizing he could not win by force, he allowed himself to be taken prisoner. Within years, he corrupted the Númenórean King Ar-Pharazôn, leading to the island’s total destruction. Though Sauron's physical body was lost in the abyss, his spirit fled back to Mordor.
He was eventually defeated at the end of the Second Age by the Last Alliance of Elves and Men. On the slopes of Orodruin, Isildur cut the One Ring from Sauron's hand, causing the Dark Lord to vanish from history for over two millennia.
The Necromancer and the War of the Ring
Sauron slowly reformed in the Third Age, first taking the guise of The Necromancer in the fortress of Dol Guldur. After being driven out by the White Council, he returned openly to Mordor and rebuilt the Barad-dûr.
His search for the One Ring drove the events of the War of the Ring. He commanded vast legions of Orcs, Trolls, and Men from the East and South. Despite his military superiority, Sauron’s fatal flaw was his inability to imagine that anyone would seek to destroy the Ring rather than use it. When the Ring was finally cast into the fire by the intervention of Gollum, Sauron’s power collapsed entirely. He was reduced to a "malicious spirit that gnaws itself in the shadows," never again able to take form or influence the world.