Herlock Saga: Nibelung no Yubiwa
English name: Harlock Saga: The Ring of the Nibelung - The Rhein Gold
Genres: Action, Adventure, Drama, Sci-Fi
Type: OVA, Episodes: 6
Aired: Jan 25, 1999 to Nov 25, 1999
Studio: Studio Z5, Studio March
Source: Manga
Rating: R - 17+ (violence & profanity)
Synopsis:
Captain Herlock is drawn into a saga of intergalactic proportions when the son of a deceased comrade unwittingly forges the Ring of the Niebelung. Evil forces gather to wage war against the last remaining superpowers of the galaxy led by a demented outcast. Herlock must counter the amassed armadas that threaten the last gods and recover the ring before Paradise is lost. 

(Source: ANN)