Written by Roy Thomas. Drawn by Gil Kane (w/assist by Alfredo Alcala). Lettered by John Costanza. Coloured by Jim Woodring. Edited by Andrew Helfer. Published in 1989-90 by DC Comics.
Summary: A squarebound, four-issue mini-series adapting Der Ring des Nibelungen, Richard Wagner’s epic musical drama, aka the Ring Cycle, based on Norse Legend and the German epic poem Nibelungenlied.
Read more about Der Ring des Nibelungen on Wikipedia. (Saves me writing a synopsis!)
The Ring has also notably been adapted in comics form, at much greater length and more faithfully to the Wagner source, by P Craig Russell in 2000; and of course, there is the two-part 1924 silent movie by the great Fritz Lang, Die Nibelungen. The Thomas & Kane version is perhaps not so different from their work on various Conan projects—it has an old school adventure comics feel. If you like those books as much as I do, you won’t see that as a drawback.