Sauron is a central antagonist in J.R.R. Tolkien's legendarium, primarily known from The Lord of the Rings and The Silmarillion. He is a powerful dark lord who seeks to dominate Middle-earth through the One Ring, a powerful artifact that he forged to control other Rings of Power. Originally a servant of the god-like being Morgoth, Sauron becomes a formidable force in his own right. His influence spreads fear and corruption, and he commands legions of dark creatures, including Orcs and Nazgûl. Sauron's quest for power ultimately leads to his downfall, as the free peoples of Middle-earth unite against him.