The One Ring, also called the Ruling Ring, Isildur's Bane, or the Precious, is a central plot element in J. R. R. Tolkien's The Lord of the Rings. It first appeared in the earlier story The Hobbit as
Critics have noted parallels with Richard Wagner's Der Ring des Nibelungen, as seen here in Josef Hoffman's 1876 set design for Das Rheingold, though they disagree on its influence on Tolkien.
Tolkien visited the temple of Nodens at a place called "Dwarf's Hill" and translated an inscription with a curse upon the thief of a ring. It may have inspired his dwarves, mines, rings, and Celebrimbor "Silver-Hand", the Elven-smith who forged Rings of Power.
The Ring of Silvianus is a Roman gold ring of around the 4th century, found near a former Roman town, Silchester that has an inscription naming Senecianus.
The shepherd Gyges finds the magic ring, setting up a moral dilemma. Ferrara, 16th century
The Rings of Power are magical artefacts in J. R. R. Tolkien's legendarium, most prominently in his high fantasy novel The Lord of the Rings. The One Ring first appeared as a plot device, a magic ring
One Ring
…It first appeared in the earlier story The Hobbit (1937) as a magic ring that grants the wearer invisibility. Tolkien changed it into a malevolent Ring of Power and rewrote parts of The Hobbit to fit in with the expanded narrative. The Lord of the Rings describes the hobbit Frodo Baggins's quest to destroy the…
J.R.R. Tolkien's sketch of the dustcover for The Two Towers, depicting the Three and the Seven Rings around the One Ring, which surrounds the Nine Rings (faint circles)
Rings of Power and their wearers as depicted in Peter Jackson's The Fellowship of the Ring (above, from left)—The Three Rings being worn by the Elves Gil-galad, Círdan (middle) and Galadriel; The Dwarves raising their Seven Rings; (below) The Nine Kings of Men wielding their Rings