The Nazgûl, also known as the Ringwraiths, are fearsome servants of Sauron in J.R.R. Tolkien's Middle-earth legendarium. Once mortal kings, they were corrupted by the power of the One Ring and transformed into wraiths, bound to the will of their dark master. Their presence instills terror, and they are often depicted as cloaked figures riding Winged Beasts. These spectral beings are relentless in their pursuit of Frodo Baggins and the One Ring, serving as a symbol of the corrupting influence of power. The Nazgûl's haunting cries and eerie presence make them some of the most memorable antagonists in Tolkien's works, particularly in The Lord of the Rings.