In the depths of the Rhine, the three Rhinemaidens guard the Rhinegold, a treasure of immeasurable value. The Nibelung dwarf Alberich is dazzled by the sight of it. The girls explain that whoever wins the gold and forges it into a ring will gain power over the world, but must first renounce love. Frustrated by his unsuccessful attempts to catch one of the girls, Alberich curses love and steals the gold. Wotan, lord of the gods, is reproached by his wife Fricka: he has promised to give Freia, goddess of youth, to the giants Fasolt and Fafner in return for their building a fortress for the gods. When the giants demand their reward, Loge, the god of fire, suggests an alternative payment: the ring Alberich has forged from the Rhinegold, and his other treasures. The giants agree, and Wotan and Loge leave for the Nibelungs’ underground home.

Deep in a forest where druids and warriors seek revenge against the conquering Romans, Norma is scorned by the Roman proconsul Pollione, with whom she has two children. Her kindness turns to fury when she discovers that Pollione has taken Adalgisa, a novice priestess, as his new lover. When Pollione loses his high rank in the army and is offered as a sacrifice, Norma promises him freedom under one condition.