The rings were made along with the others in Eregion and were forged by Celebrimbor. Those were locked away in one of the safes of Eregion, but all were captured by Sauron. He gave nine of them to nine kings of Men, three of which were Numenoreans.
The owners of the nine eventually became the Nazgûl.
During the end of the Third Age, Sauron had the Nine with him.
The Rings of Power gave their wearer powerful magical abilities and made gave them the ability to influence peoples' will.
On Men those effects could be special: The rings gave a very long life, but the wearer would begin to feel worn out and eventually fade away into a wraith. The nine kings given the rings turned into ringwraiths because Sauron was able to take control of the rings.
Possession of the Nine Rings
In The Council of Elrond Gandalf says that the Nazgûl kept their Rings by saying "The Nine the Nazgûl keep". However in most other references, it is mentioned that Sauron had taken them. Furthermore, Frodo doesn't see any Rings on them on Weathertop, and it is believed that if they did wear the Rings, they would have been fully invisible (including their cloaks).[source?]
The line in the Council of Elrond represents Tolkien's earlier intention that the Nazgûl should still be wearing their Rings, but he later changed his mind and simply missed revising that sentence.
|Rings of Power|
|The One Ring|
|(Narya · Nenya · Vilya)|
|(Ring of Thrór)|
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