The Lord of the Rings: The Fellowship of the Ring

The Dark Lord Sauron, forges the "Ruling Ring of Power" in Mordor. In battle it is cut off by Isildur who claims it, but is later killed by Orcs and the Ring falls into the Great River. Gollum murderously obtains The Ring while fishing, and keeps it for a very long time before losing it, when it is found by Bilbo Baggins. Unaware of its origins, Frodo Baggins inherits the ring from Bilbo. Gollum eventually wanders into Mordor while looking for the Ring and is captured and interrogated by Sauron's minions who sends the Ringwraiths to find it.