Lord of The Rings - The One Ring

The creation of the "One Ring" or the "Ring of Sauron" goes back to the
years following the fall of Morgoth. At this time, Sauron established his
desire to bring the Elves, and indeed all the people of Middle-Earth, under
his control. In order to bring the Elves under
his control, Sauron persuaded them that his intentions were good, and that
he wanted Middle-Earth to return from the darkness it was in. Eventually
the elves sided with Sauron, and created the Rings of Power under his
guidance. Following the creation of these rings, Sauron created the One
Ring in secret, so that he would be able to control the other rings and
consequently control the Elves. The creation of the Ring, and the essence
of its power is revealed in the following passage.
"and their power was bound up with it, to be subject wholly to it and to
last only as long as it too should last. And much of the strength and will
of Sauron passed into that One Ring; for the power of the Elven
Ri...