Fictional magical rings in J. R. R. Tolkien's legendarium
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 in Tolkien's children's fantasy novel, The Hobbit. Tolkien later gave it a backstory and much greater power: he added nineteen other Great Rings which also conferred powers such as invisibility, and which the One Ring could control. These were the Three Rings of the Elves, the Seven Rings for the Dwarves, and the Nine for Men.
https://en.wikipedia.org/wiki/Rings_of_Power