[Kransha]

Let's see....
Well, the obvious mythological comparison is to the nordic myth, eventually made into a Wagner opera, namely "The Rings of the Neibellungen" (I KNOW the spelling is wrong). That's a story about rings of power. Read the nordic tales of "Sigurd and Fafnir" or "The Eddas". Fafnir, of those myths, was one of the first dragons in literature to be given personality, which has led many to believe that he was the basis for Smaug or Glaurung. Also, read Beowulf to famialrize yourself with language and lore references.