I just looked into my copy of the Hobbit and was surprised how early the encounter with Gollum actually is. It's chapter 5 out of 19.
Gollum did have a ring, that allowed the bearer to turn invisible, which Bilbo found by accident - and used to escape. Tolkien seems to have expanded on that idea afterwards, turning this ring into the Ring of Power for the Lord of the Rings books.
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