The Rhein Maidens (or Rhein Guardians) are the three magical, immortals and young maidens, their home on the River Rhein, the maidens devote their lives to protect the invaluable metal, the Rheingold.
Xena tricked the Rhein Maidens into trusting her and guiding her to where they kept her. Then she stole it and forged the ring. 35 years later, a reformed Xena returned the ring to the Rhein Maidens. Surprised by the change in Xena, the maid more. Xena and Gabrielle exchanged knowing looks when Xena explains, "It was not magic " It can be equated with the nymphs.
They were played by Marama Jackson, Lucy Thomas and Stephanie Bertram.
Rhein's maidens are not mythological, but they are inventions of Richard Wagner for his opera Der Ring des Nibelungen, which was combined with the epic of the old English Beowulf to create Nordic history. In the story they were water nymphs.